[RNMobile] Prevent blocks being un-wantingly replaced with newly adde…

…d blocks (#49154)

The changes in logic surrounding dictation handling in #49056 led to a regression where currently selected blocks are replaced with newly added blocks. This PR addresses that issue by reverting the changes to the dictation logic.

packages/react-native-aztec/ios/RNTAztecView/RCTAztecView.swift

@@ -100,13 +100,7 @@ class RCTAztecView: Aztec.TextView {
     /// the dictation engine refreshes the TextView with an empty string when the dictation finishes.
     /// This helps to avoid propagating that unwanted empty string to RN. (Solving #606)
     /// on `textViewDidChange` and `textViewDidChangeSelection`
-    private var isInsertingDictationResult: Bool = {
-        if #available(iOS 16, *) {
-            return true;
-        } else {
-            return false;
-        }
-    }()
+    private var isInsertingDictationResult = false
 
     // MARK: - Font
 
@@ -364,14 +358,10 @@ class RCTAztecView: Aztec.TextView {
     }
 
     public override func insertDictationResult(_ dictationResult: [UIDictationPhrase]) {
+        let objectPlaceholder = "\u{FFFC}"
         let dictationText = dictationResult.reduce("") { $0 + $1.text }
-        if #available(iOS 16, *) {
-            insertText(dictationText)
-        } else {
-            let objectPlaceholder = "\u{FFFC}"
-            isInsertingDictationResult = false
-            self.text = self.text?.replacingOccurrences(of: objectPlaceholder, with: dictationText)
-        }
+        isInsertingDictationResult = false
+        self.text = self.text?.replacingOccurrences(of: objectPlaceholder, with: dictationText)
     }
 
     // MARK: - Custom Edit Intercepts