fixup: simplify excluding of MacGPG2 folder

uninstall.sh

@@ -395,12 +395,6 @@ fi
 for file in "${homebrew_files[@]}"
 do
 
-  if [[ "${file}" == "/usr/local/MacGPG2/"* ]]
-  then
-    warn "Skipping protected directory: ${file}"
-    continue
-  fi
-
   if [[ -n "${opt_dry_run}" ]]
   then
     echo "Would delete ${file}"
@@ -469,6 +463,8 @@ fi
 dir_children "${HOMEBREW_REPOSITORY}" "${HOMEBREW_PREFIX}" |
   sort -u >"${tmpdir}/residual_files"
 
+grep -v "MacGPG2" "${tmpdir}/residual_files" > "${tmpdir}/filtered_residual_files"
+
 if [[ -s "${tmpdir}/residual_files" && -z "${opt_quiet}" ]]
 then
   echo "The following possible Homebrew files were not deleted:"