Delete unused metafile for Sound folder (#166)

UOP1_Project/Assets/Scripts/Sound.meta

-fileFormatVersion: 2
-guid: 7f027bef4434b504f9b49753067f5ea1
-folderAsset: yes
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: