Use the only working iOS focus API (#166)

Seems like `UITextView.focused` and `UITextView.isFocused` stopped
working overnight so I switched to the only focus check API that works
now.
Fixes issue with strange entering for new lists/quotes points.

Author: szydlovsky

ios/utils/TextInsertionUtils.mm

@@ -18,7 +18,7 @@ + (void)insertText:(NSString*)text at:(NSInteger)index additionalAttributes:(NSD
   [textView.textStorage insertAttributedString:newAttrStr atIndex:index];
 
   if(withSelection) {
-    if(!textView.focused) {
+    if(![textView isFirstResponder]) {
       [textView reactFocus];
     }
     textView.selectedRange = NSMakeRange(index + text.length, 0);
@@ -38,7 +38,7 @@ + (void)replaceText:(NSString*)text at:(NSRange)range additionalAttributes:(NSDi
   }
 
   if(withSelection) {
-    if(!textView.focused) {
+    if(![textView isFirstResponder]) {
       [textView reactFocus];
     }
     textView.selectedRange = NSMakeRange(range.location + text.length, 0);

ios/utils/ZeroWidthSpaceUtils.mm

@@ -63,8 +63,7 @@ + (void)removeSpacesIfNeededinInput:(EnrichedTextInputView *)input {
   }
 
   // fix the selection if needed
-  if(input->textView.focused) {
-    [input->textView reactFocus];
+  if([input->textView isFirstResponder]) {
     input->textView.selectedRange = NSMakeRange(preRemoveSelection.location + postRemoveOffset, preRemoveSelection.length);
   }
 }
@@ -112,8 +111,7 @@ + (void)addSpacesIfNeededinInput:(EnrichedTextInputView *)input {
   }
 
   // fix the selection if needed
-  if(input->textView.focused) {
-    [input->textView reactFocus];
+  if([input->textView isFirstResponder]) {
     input->textView.selectedRange = NSMakeRange(preAddSelection.location + postAddOffset, preAddSelection.length);
   }
 }