Fix Unwanted space insertion in single-line MarkdownTextInput when replacing selected text#717

TaduJR wants to merge 3 commits intoExpensify:mainExpensify/react-native-live-markdown:mainfrom

TaduJR:fix-unwanted-space-insertion-in-single-line-MarkdownTextInput-when-replacing-selected-textTaduJR/react-native-live-markdown:fix-unwanted-space-insertion-in-single-line-MarkdownTextInput-when-replacing-selected-textCopy head branch name to clipboard