Fix onChangeText not firing when clearing the value of TextInput with multiline=true on iOS

[kkoudev]

Summary:

This fix fixes the TextInput issue in #37784 with onChangeText not working on iOS only.

Changelog:

[IOS] [FIXED] - Fix onChangeText not firing when clearing the value of TextInput with multiline=true on iOS

Test Plan:

1. Run the repro code given in the issue (When multiline=true, TextInput's onChangeText() callback may not fire. #37784).
2. Verified that onChangeText works after pressing the submit button.
3. Run the repro code from the issue (TextInput onChangeText called automatically for maxLength and multiline #36494) that caused this issue.
4. Verified that issue (TextInput onChangeText called automatically for maxLength and multiline #36494) is not reoccurring.