fix(ios): emit onPageSelected for vertical orientation and initialPage - #1070

fix(ios): emit onPageSelected for vertical orientation and initialPage#1070

MrRefactor wants to merge 2 commits into

mastercallstack/react-native-pager-view:masterfrom

fix/vertical-on-page-selectedcallstack/react-native-pager-view:fix/vertical-on-page-selectedCopy head branch name to clipboard