kiss: remove unsupported glyph

*** Background

Liberation Mono, which is the "default" font set in the core repo, does not support the "✓" glyph. 

*** Change
Suggested removing unsupported glyph(s).

*** Alternative Solution
Add additional or patched font to support more glyphs or add alternative font set (e.g. Terminus) to main repository for better unicode and glyph support.

*** Source 
https://fonts2u.com/liberation-mono.font

kiss

@@ -1189,7 +1189,7 @@ pkg_updates() {
             # Display a tick if signing is enabled for this
             # repository.
             case $(git config merge.verifySignatures) in
-                true) log "$PWD" "[signed ✓] " ;;
+                true) log "$PWD" "[signed] " ;;
                 *)    log "$PWD" " " ;;
             esac