[MIRROR] Adds a check grep for using src as a trait source rather that REF(src) [MDB IGNORE] (#23264)

* Adds a check grep for using `src` as a trait source rather that `REF(src)` (#77836)

## About The Pull Request

Using `src` as a trait source is an error and can often lead to
hard-deletes

If you wish to tie a source to a certain datum, it is common to use
`REF(src)` instead.

Ideally, we would lint or test for any use of a reference rather than a
string in use in trait sources, but that's a bit harder to setup.
Currently (from what I can see) the *only* erroneous use of references
as sources are via `src`, so it being the most common error, I see it
fine to lint for it.

## Changelog

Nothing player facing.

* Adds a check grep for using `src` as a trait source rather that `REF(src)`

* Update style.dm

---------

Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>
Co-authored-by: Giz <13398309+vinylspiders@users.noreply.github.com>

code/modules/projectiles/projectile/energy/_energy.dm

@@ -11,4 +11,4 @@
 	. = ..()
 
 	ADD_TRAIT(src, TRAIT_FREE_HYPERSPACE_MOVEMENT, INNATE_TRAIT)
-	ADD_TRAIT(src, TRAIT_FREE_HYPERSPACE_MOVEMENT, TRAIT_FREE_HYPERSPACE_SOFTCORDON_MOVEMENT)
+	ADD_TRAIT(src, TRAIT_FREE_HYPERSPACE_SOFTCORDON_MOVEMENT, INNATE_TRAIT)