compositor: Clarify XDG_RUNTIME_DIR misconfiguration message

If only the mode or the owner are wrong, do not say both are wrong.
Change the text to state that there's a problem and the current
values, and let the user figure it out.

Signed-off-by: Guillem Jover <guillem@hadrons.org>

src/compositor.c

@@ -3983,9 +3983,8 @@ static const char xdg_wrong_message[] =
 
 static const char xdg_wrong_mode_message[] =
 	"warning: XDG_RUNTIME_DIR \"%s\" is not configured\n"
-	"correctly.  Unix access mode must be 0700 but is %o,\n"
+	"correctly.  Unix access mode must be 0700 (current mode is %o),\n"
-	"and XDG_RUNTIME_DIR must be owned by the user, but is\n"
+	"and must be owned by the user (current owner is UID %d).\n";
-	"owned by UID %d.\n";
 
 static const char xdg_detail_message[] =
 	"Refer to your distribution on how to get it, or\n"