remove testable suffix (not needed)

MaterialGraphProject/ProjectSettings/EditorSettings.asset

   m_EtcTextureBestCompressor: 5
   m_ProjectGenerationIncludedExtensions: txt;xml;fnt;cd;uss
   m_ProjectGenerationRootNamespace: 
-  m_UserGeneratedProjectSuffix: -testable
+  m_UserGeneratedProjectSuffix: 
   m_CollabEditorSettings:
     inProgressEnabled: 1