'main': Fix a bug concerning command word with embedded colon-space sequences.

Such a command word would, if not valid, fall through to the `type -w` case,
where the output would be misparsed, consequently the forward-compatible [arg0]
style would be used.

highlighters/main/main-highlighter.zsh

@@ -147,7 +147,7 @@ _zsh_highlight_main__type() {
     fi
   fi
   if ! (( $+REPLY )); then
-    REPLY="${$(LC_ALL=C builtin type -w -- $1 2>/dev/null)#*: }"
+    REPLY="${$(LC_ALL=C builtin type -w -- $1 2>/dev/null)##*: }"
   fi
   if (( $+_zsh_highlight_main__command_type_cache )); then
     _zsh_highlight_main__command_type_cache[(e)$1]=$REPLY