fix: Repair applicationNameForUserAgent usage

This is a value on the WebView configuration, not the WebView itself.

Author: dcalhoun

ios/Sources/GutenbergKit/Sources/EditorViewController.swift

@@ -177,7 +177,7 @@ public final class EditorViewController: UIViewController, GutenbergEditorContro
 
         self.webView = GBWebView(frame: .zero, configuration: config)
         self.webView.scrollView.keyboardDismissMode = .interactive
-        self.webView.applicationNameForUserAgent = "GutenbergKit/\(GutenbergKit.version)"
+        self.webView.configuration.applicationNameForUserAgent = "GutenbergKit/\(GutenbergKit.version)"
 
         self.isWarmupMode = isWarmupMode
 

ios/Sources/GutenbergKit/Sources/Views/HTMLPreview/HTMLWebViewRenderer.swift

@@ -94,7 +94,7 @@ final class HTMLWebViewRenderer {
             // Create web view with small initial frame for off-screen rendering
             // Frame will be adjusted per render based on viewport width and content height
             webView = WKWebView(frame: CGRect(x: 0, y: 0, width: 1200, height: 100), configuration: config)
-            webView.applicationNameForUserAgent = "GutenbergKit/\(GutenbergKit.version)"
+            webView.configuration.applicationNameForUserAgent = "GutenbergKit/\(GutenbergKit.version)"
 
             delegate = RenderDelegate()
             webView.navigationDelegate = delegate