Fix the problem that children of textinput would be cleared when setting the selection prop

[ZhuoYitao]

Fix the problem that children of TextInput would be cleared when setting the selection prop.

Summary:

This PR Fix the problem that children of TextInput would be cleared when setting the selection prop. Here is a related issue

Changelog:

[GENERAL] [FIXED] - Fix the problem that children of TextInput would be cleared when setting the selection prop.

Test Plan:

According to logic in ReactTextInputManager.java, we should pass a null from JS to Java if we don't want to set text of TextInput.

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