Allow developer to specify a tabBarOnPress function and set backToInitial to be true for tabs #3012
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See issue #2932
Previously, if backToInitial was set, any function set in tabBarOnPress would not be called. In this commit, I checked if the developer specified a tabBarOnPress function and set backToInitial to be true; if so, we will run the code for backToInitial [ie. set tab child to initial Scene] and then call the user specified tabBarOnPress function.