fix magic missile hitting the user if they move while casting it (Par…

…adiseSS13#27383)

code/datums/spells/projectile_spell.dm

@@ -30,6 +30,7 @@
 			projectile.icon_state = proj_icon_state
 			projectile.dir = get_dir(target, projectile)
 			projectile.name = proj_name
+			projectile.firer = user
 			var/current_loc = get_turf(projectile)
 
 			for(var/i in 1 to proj_lifespan)