Fixes AIs getting thrown by Leviathan fire. (#17278)

Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/modules/overmap/ship_weaponry/_ship_gun.dm

@@ -174,7 +174,7 @@
 		var/list/connected_z_levels = GetConnectedZlevels(z)
 		for(var/mob/M in living_mob_list)
 			if(M.z in connected_z_levels)
-				if(!M.Check_Shoegrip() && !M.buckled_to)
+				if(!M.Check_Shoegrip() && !M.buckled_to && !M.anchored)
 					M.throw_at_random(FALSE, 7, 10)
 	flick("weapon_firing", src)
 	return TRUE

html/changelogs/mattatlas-throwmobs.yml

@@ -0,0 +1,41 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.
+author: MattAtlas
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - bugfix: "Fixes AIs getting thrown by Leviathan fire."