registerBottomTabSelectedListener returns incorrect unselectedTabIndex value

[peterh32]

registerBottomTabSelectedListener returns incorrect unselectedTabIndex

As of RNN 6.7.5, the registerBottomTabSelectedListener callback is now passed the correct value for selectedTabIndex, but unselectedTabIndex is not correct; it's always just the same as selectedTabIndex.

Note that both callback params were broken (always 0,0) in 6.7.4 -- here's that issue: #6254

Steps to Reproduce / Code Snippets / Screenshots

		this.bottomTabEventListener = RNN.events().registerBottomTabSelectedListener(
			({ selectedTabIndex, unselectedTabIndex }) => {
				console.tron.log(selectedTabIndex, unselectedTabIndex);
			}
		);

Will always log an identical pair, e.g. [0,0], [2,2] etc.

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Environment

• React Native Navigation version: 6.7.5
• React Native version: 0.61.5
• Platform(s) (iOS, Android, or both?): iOS
• Device info (Simulator/Device? OS version? Debug/Release?): Simulator (did not test on device)