Pisces: correct layout macro reference in info.json (#13410)

keyboards/pisces/info.json

@@ -5,7 +5,7 @@
     "width": 15,
     "height": 3,
     "layouts": {
-        "LAYOUT": {
+        "LAYOUT_split_3x6_1": {
             "layout": [
                 {"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0}, {"x":3, "y":0}, {"x":4, "y":0}, {"x":5, "y":0},                                 {"x":9, "y":0}, {"x":10, "y":0}, {"x":11, "y":0}, {"x":12, "y":0}, {"x":13, "y":0}, {"x":14, "y":0},
                 {"x":0, "y":1}, {"x":1, "y":1}, {"x":2, "y":1}, {"x":3, "y":1}, {"x":4, "y":1}, {"x":5, "y":1},                                 {"x":9, "y":1}, {"x":10, "y":1}, {"x":11, "y":1}, {"x":12, "y":1}, {"x":13, "y":1}, {"x":14, "y":1},

keyboards/pisces/rules.mk

@@ -23,5 +23,3 @@ AUDIO_ENABLE = no           # Audio output
 
 # Enable generic behavior for split boards
 SPLIT_KEYBOARD = yes
-
-LAYOUTS = split_3x6_1  # total 38