Remove dead code added by https://github.com/Frogging-Family/linux-tkg/pull/239

Thanks to @CodingKoopa for pointing it out

linux-tkg-config/prepare

@@ -365,9 +365,6 @@ _tkg_srcprep() {
   scripts/setlocalversion --save-scmversion
 
   if [ "${_distro}" = "Arch" ]; then
-    # Reset local version string if ever it's in the .config file
-    scripts/config --set-str localversion ""
-
     echo "-$pkgrel-tkg-${_cpusched}${_compiler_name}" > localversion.10-pkgrel
     echo -e "Version tail set to \"-$pkgrel-tkg-${_cpusched}${_compiler_name}\"\n" > "$_where"/prepare.log
     echo "" > localversion.20-pkgname