Call setTextKeepState instead of setText and setSelection (#605)

Author: tomekzaw

android/src/main/java/com/expensify/livemarkdown/MarkdownTextInputDecoratorView.java

@@ -93,10 +93,7 @@ protected void setParserId(int parserId) {
 
   protected void applyNewStyles() {
     if (mReactEditText != null) {
-      int selectionStart = mReactEditText.getSelectionStart();
-      int selectionEnd = mReactEditText.getSelectionEnd();
-      mReactEditText.setText(mReactEditText.getText()); // trigger update
-      mReactEditText.setSelection(selectionStart, selectionEnd);
+      mReactEditText.setTextKeepState(mReactEditText.getText()); // trigger update
     }
   }
 }