refactor(scp): rename local var "_dirs{ => _}only" for consistency

Author: akinomyoga

completions/ssh

@@ -597,9 +597,9 @@ _scp_remote_files()
 # @since 2.12
 _comp_xfunc_scp_compgen_local_files()
 {
-    local _dirsonly=""
+    local _dirs_only=""
     if [[ ${1-} == -d ]]; then
-        _dirsonly=set
+        _dirs_only=set
         shift
     fi
 
@@ -611,7 +611,7 @@ _comp_xfunc_scp_compgen_local_files()
     _comp_expand_glob files '"$cur_val"*' || return 0
     _comp_compgen -RU files split -l ${1:+-P "$1"} -- "$(
         command ls -aF1dL "${files[@]}" 2>/dev/null |
-            _comp_cmd_scp__escape_path ${_dirsonly:+'-d'}
+            _comp_cmd_scp__escape_path ${_dirs_only:+'-d'}
     )"
 }