Added Oppenhopper poster to the game. (#33588)

* o7

* -

* oppenhopper v2

* Update Resources/Prototypes/Entities/Structures/Wallmounts/Signs/posters.yml

* Update Resources/Prototypes/Entities/Structures/Wallmounts/Signs/posters.yml

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Resources/Textures/Structures/Wallmounts/posters.rsi/meta.json

@@ -1,7 +1,7 @@
 {
   "version": 1,
   "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from  at commit https://github.com/tgstation/tgstation/commit/f01de25493e2bd2706ef9b0303cb0d7b5e3e471b.     poster52_contraband, poster53_contraband and poster54_contraband taken from https://github.com/vgstation-coders/vgstation13/blob/435ed5f2a7926e91cc31abac3a0d47d7e9ad7ed4/icons/obj/posters.dmi.     originmap, poster55_contraband, poster56_contraband, poster57_contraband and poster39_legit by discord brainfood#7460,     poster63_contraband by discord foboscheshir_,     poster52_legit by SlamBamActionman",
+  "copyright": "Taken from  at commit https://github.com/tgstation/tgstation/commit/f01de25493e2bd2706ef9b0303cb0d7b5e3e471b.     poster52_contraband, poster53_contraband and poster54_contraband taken from https://github.com/vgstation-coders/vgstation13/blob/435ed5f2a7926e91cc31abac3a0d47d7e9ad7ed4/icons/obj/posters.dmi.     originmap, poster55_contraband, poster56_contraband, poster57_contraband and poster39_legit by discord brainfood#7460,     poster63_contraband by discord foboscheshir_,     poster52_legit by SlamBamActionman,     poster53_legit and the original version by @RCOI on discord.",
   "size": {
     "x": 32,
     "y": 32
@@ -384,6 +384,9 @@
     {
       "name": "poster52_legit"
     },
+    {
+      "name": "poster53_legit"
+    },
     {
       "name": "random_legit"
     },