Fix podspec to remove non-swift files from source

[lareinating]

Fix error while integrating into project

Error Message:

Multiple commands produce '../Debug-appletvsimulator/TVMultiPicker/TVMultiPicker.framework/Info.plist':
1) Target 'TVMultiPicker' (project 'Pods') has copy command from '../Pods/TVMultiPicker/TVMultiPicker/Info.plist' to '../Library/Developer/Xcode/DerivedData/Build/Products/Debug-appletvsimulator/TVMultiPicker/TVMultiPicker.framework/Info.plist'
2) Target 'TVMultiPicker' (project 'Pods') has process command with output '../Library/Developer/Xcode/DerivedData/Build/Products/Debug-appletvsimulator/TVMultiPicker/TVMultiPicker.framework/Info.plist'

Info.plist in TVMultiPicker causing this error