util: add one more helper for generating colored check mark glyphs

This one is useful for a outputs with a slightly more "positive"
outlook, i.e. where only the checkmarks are shown but the crossmarks are
replaced by spaces.

(Usecase: a larger table with many checkmarks, where the red crossmarks
might just be too much negative noise)

src/basic/locale-util.h

@@ -98,3 +98,7 @@ static inline void locale_variables_freep(char*(*l)[_VARIABLE_LC_MAX]) {
 static inline const char *special_glyph_check_mark(bool b) {
         return b ? special_glyph(SPECIAL_GLYPH_CHECK_MARK) : special_glyph(SPECIAL_GLYPH_CROSS_MARK);
 }
+
+static inline const char *special_glyph_check_mark_space(bool b) {
+        return b ? special_glyph(SPECIAL_GLYPH_CHECK_MARK) : " ";
+}