fix(_comp_cmd): properly register quoted relative-path command

Author: akinomyoga

bash_completion

@@ -3338,7 +3338,7 @@ _comp_load()
                             eval "$compspec \"\$rawcmd\""
                         # If invoked without path, that one should be set, too
                         # ...but let's not overwrite an existing one, if any
-                        [[ $origcmd != */* ]] &&
+                        [[ $origcmd != "$cmd" && $origcmd != "$rawcmd" ]] &&
                             ! complete -p -- "$origcmd" &>/dev/null &&
                             eval "$compspec \"\$origcmd\""
                         return 0