Use value directly in placeholderTextColor

[peachbits]

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[samholmes]

I would expect that passing the shared value to this property would allow for reanimated to animate the InputText property. If we pass the value directly, we get no animation behavior. If we don't want animation behavior, then the correct fixed is to change the variable from a SharedValue<string> to string

[paullinator]

Ack. ok then a different fix is required

[samholmes]

This PR commit the issue with placeholder color animation: 7c1eab0