Added Appletun-Gmax, removed Gen8 Genesect-Standard

* Added appletun-gmax normal and shiny sprites
* removed genesect-standard from the gen8 folder (was the old version of the sprite, gen8 doesn't appear to have a standard [non-drive] variation)

data/pokemon.json

@@ -27245,6 +27245,9 @@
       "forms": {
         "$": {
           "is_prev_gen_icon": false
+        },
+        "gmax": {
+          "is_prev_gen_icon": false
         }
       }
     }