Fix git submodules update called anyways (#1450)

Ignoring FBT_NO_SYNC

fbt.cmd

@@ -11,7 +11,6 @@ if [%FBT_NO_SYNC%] == [] (
         exit /b 1
     )
 )
-git submodule update --init
 
 set "SCONS_DEFAULT_FLAGS=-Q --warn=target-not-built"
 python lib\scons\scripts\scons.py %SCONS_DEFAULT_FLAGS% %*