Fixes UIActivityIndicatorView.style deprecation warnings

AltStore/Authentication/AuthenticationViewController.swift

@@ -32,6 +32,7 @@ final class AuthenticationViewController: UIViewController
         super.viewDidLoad()
         
         self.signInButton.activityIndicatorView.style = .medium
+        self.signInButton.activityIndicatorView.color = .white
         
         for view in [self.appleIDBackgroundView!, self.passwordBackgroundView!, self.signInButton!]
         {

AltStore/Browse/BrowseViewController.swift

@@ -96,6 +96,7 @@ private extension BrowseViewController
             
             cell.bannerView.button.addTarget(self, action: #selector(BrowseViewController.performAppAction(_:)), for: .primaryActionTriggered)
             cell.bannerView.button.activityIndicatorView.style = .medium
+            cell.bannerView.button.activityIndicatorView.color = .white
             
             // Explicitly set to false to ensure we're starting from a non-activity indicating state.
             // Otherwise, cell reuse can mess up some cached values.

AltStore/Components/PillButton.swift

@@ -95,6 +95,7 @@ final class PillButton: UIButton
         self.contentEdgeInsets = UIEdgeInsets(top: Self.contentInsets.top, left: Self.contentInsets.leading, bottom: Self.contentInsets.bottom, right: Self.contentInsets.trailing)
         
         self.activityIndicatorView.style = .medium
+        self.activityIndicatorView.color = .white
         self.activityIndicatorView.isUserInteractionEnabled = false
         
         self.progressView.progress = 0

AltStore/Settings/PatreonComponents.swift

@@ -41,6 +41,7 @@ final class PatronsFooterView: UICollectionReusableView
         
         self.button.translatesAutoresizingMaskIntoConstraints = false
         self.button.activityIndicatorView.style = .medium
+        self.button.activityIndicatorView.color = .white
         self.button.titleLabel?.textColor = .white
         self.addSubview(self.button)