Fix infinite recursion on entity "angle" keyvalue

ValveSoftware/source-sdk-2013#380

mp/src/game/shared/baseentity_shared.cpp

@@ -414,7 +414,7 @@ bool CBaseEntity::KeyValue( const char *szKeyName, const char *szValue )
 		}
 
 		// Do this so inherited classes looking for 'angles' don't have to bother with 'angle'
-		return KeyValue( szKeyName, szBuf );
+		return KeyValue( "angles", szBuf );
 	}
 
 	// NOTE: Have to do these separate because they set two values instead of one