Fix inigrep query quoting

Absence of quotes breaks queries with spaces.  We're already taking care
of files (implicit or given on command line).

src/shellfu/saturnin.sh

     fi
     debug -v files
     #shellcheck disable=SC2086
-    _saturnin__conf__load "${files[@]}" | inigrep $ig_limit $ig_mode $ig_query
+    _saturnin__conf__load "${files[@]}" | inigrep $ig_limit $ig_mode "$ig_query"
     return "${PIPESTATUS[0]}"
 }