Fix black background on android

[alanjhughes]

Overview

Closes #226
Calling setLayerType from setRenderingMode and passing null as the paint reference will cause the default paint to be used which will have it's PorterDuffXfermode set to SRC_OVER. This causes the incorrect result.

I've added a new mRenderingMode property that is used to call setLayerType from dispatchDraw where we have a paint reference with the correct PorterDuffXfermode set.

Test Plan

I've updated the example app to use 0.75 and tested both platforms on both architectures.

[samueljim]

LGTM

[samueljim]

I'm currently using this in my package.json for all those who need this fix

"@react-native-masked-view/masked-view": "https://github.com/react-native-masked-view/masked-view/archive/edee2e76a3ead5135d8328ec5c5073415e4c9dbe.tar.gz",

[samueljim]

BUMP

[AliRezaBeigy]

as @samueljim tested it's ok
i test it too and the black background issue goes away
@Naturalclar can you merge these change?

[Naturalclar]

thank you so much!