steal_this_keyboard fix info.json macro reference (#15032)

- change LAYOUT to LAYOUT_split_3x5_2

keyboards/steal_this_keyboard/info.json

@@ -3,7 +3,7 @@
     "url": "https://github.com/obosob/steal_this_keyboard",
     "maintainer": "@obosob",
     "layouts": {
-        "LAYOUT": {
+        "LAYOUT_split_3x5_2": {
             "layout": [
                 {"x": 0, "y": 0.93},
                 {"x": 1, "y": 0.31},