Changes OOC color settings so donators aren't defaulted to mentor col…

…ors (#6615)

# About the pull request

As title

# Explain why it's good for the game

Indifferent


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
code: Changes OOC color settings for donators/non mentor/staff.
/:cl:

code/game/verbs/ooc.dm

@@ -42,7 +42,8 @@
 	if(!display_colour)
 		display_colour = CONFIG_GET(string/ooc_color_normal)
 	if(admin_holder && !admin_holder.fakekey)
-		display_colour = CONFIG_GET(string/ooc_color_other)
+		if(admin_holder.rights & R_MENTOR)
+			display_colour = CONFIG_GET(string/ooc_color_other)
 		if(admin_holder.rights & R_DEBUG)
 			display_colour = CONFIG_GET(string/ooc_color_debug)
 		if(admin_holder.rights & R_MOD)