Update PostProcessBuildPlayer-Burstly to better support paths containing spaces

The copy from the Plugins/iOS/BurstlySDK directory to the XCode Libraries directory fails if there is a space in either path. Corrected the cp command call to wrap the paths in quotes.
Merge branch 'patch-1' of https://github.com/CoderDawson/BurstlyUnityPlugin into CoderDawson-patch-1

Conflicts:
	Source/UnityFiles/Editor/PostProcessBuildPlayer-Burstly