bug-fix: fix useMainProfile not saved / not set during initialization

SideStore is killed by iOS before CoreData commit changes to db.

Detect if the app is installed with useMainProfile by checking if applicationIdentifier matches

AltStore/Operations/InstallAppOperation.swift

@@ -176,6 +176,13 @@ final class InstallAppOperation: ResultOperation<InstalledApp>
             
             var installing = true
             if installedApp.storeApp?.bundleIdentifier.range(of: Bundle.Info.appbundleIdentifier) != nil {
+                do {
+                    // we need to flush changes to the disk now in case the changes are lost when iOS kills current process
+                    try installedApp.managedObjectContext?.save()
+                } catch {
+                    print("Failed to flush installedApp to disk: \(error)")
+                }
+                
                 // Reinstalling ourself will hang until we leave the app, so we need to exit it without force closing
                 DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
                     if UIApplication.shared.applicationState != .active {

AltStoreCore/Model/DatabaseManager/DatabaseManager.swift

@@ -399,6 +399,40 @@ private extension DatabaseManager
                 // For backwards compatibility reasons, we cannot use localApp's buildVersion as storeBuildVersion,
                 // or else the latest update will _always_ be considered new because we don't use buildVersions in our source (yet).
                 installedApp = InstalledApp(resignedApp: localApp, originalBundleIdentifier: StoreApp.altstoreAppID, certificateSerialNumber: serialNumber, storeBuildVersion: nil, context: context)
+                
+                // figure out if the current AltStoreApp is signed with "Use Main Profie" option
+                // by checking if the first extension's entitlement's application-identifier matches current one
+                repeat {
+                    guard let pluginURL = Bundle.main.builtInPlugInsURL else {
+                        installedApp.useMainProfile = true
+                        break
+                    }
+                    guard let pluginFolders = try? FileManager.default.contentsOfDirectory(at: pluginURL, includingPropertiesForKeys: nil) else {
+                        installedApp.useMainProfile = true
+                        break
+                    }
+                    
+                    guard let pluginFolder = pluginFolders.first, let altPluginApp = ALTApplication(fileURL: pluginFolder) else {
+                        installedApp.useMainProfile = true
+                        break
+                    }
+                    
+                    let entitlements = altPluginApp.entitlements
+                    guard let appId = entitlements[ALTEntitlement.applicationIdentifier] as? String else {
+                        installedApp.useMainProfile = false
+                        print("no ALTEntitlementApplicationIdentifier???")
+                        break
+                    }
+                    
+                    if appId.hasSuffix(Bundle.main.bundleIdentifier!) {
+                        installedApp.useMainProfile = true
+                    } else {
+                        installedApp.useMainProfile = false
+                    }
+                    
+                    
+                } while(false)
+                
                 installedApp.storeApp = storeApp
             }