Remove improper offset flags

Author: ZeeMaji

objects/rct2tt/scenery_small/rct2tt.scenery_small.stmdran1.json

@@ -16,7 +16,6 @@
         "animationMask": 15,
         "numFrames": 16,
         "shape": "4/4",
-        "SMALL_SCENERY_FLAG_VOFFSET_CENTRE": true,
         "isRotatable": true,
         "isAnimated": true,
         "isStackable": true,

objects/rct2tt/scenery_small/rct2tt.scenery_small.wiskybl1.json

@@ -13,7 +13,6 @@
         "cursor": "CURSOR_STATUE_DOWN",
         "height": 16,
         "shape": "4/4",
-        "SMALL_SCENERY_FLAG_VOFFSET_CENTRE": true,
         "requiresFlatSurface": true,
         "isRotatable": true,
         "isStackable": true

objects/rct2ww/scenery_small/rct2ww.scenery_small.babyele.json

@@ -13,7 +13,6 @@
         "cursor": "CURSOR_STATUE_DOWN",
         "height": 32,
         "shape": "4/4",
-        "SMALL_SCENERY_FLAG_VOFFSET_CENTRE": true,
         "requiresFlatSurface": true,
         "isRotatable": true,
         "hasPrimaryColour": true,