Fix `boardsource/unicorne` RGB Matrix Coordinates (#25556)

please see https://github.com/qmk/qmk_firmware/issues/23224

keyboards/boardsource/unicorne/keyboard.json

@@ -118,9 +118,9 @@
             {"matrix": [6, 1], "x": 208, "y": 42, "flags": 4},
             {"matrix": [5, 1], "x": 208, "y": 24, "flags": 4},
             {"matrix": [4, 1], "x": 208, "y": 7, "flags": 4},
-            {"matrix": [4, 0], "x": 0, "y": 7, "flags": 1},
-            {"matrix": [5, 0], "x": 0, "y": 24, "flags": 1},
-            {"matrix": [6, 0], "x": 0, "y": 41, "flags": 1}
+            {"matrix": [4, 0], "x": 223, "y": 7, "flags": 1},
+            {"matrix": [5, 0], "x": 223, "y": 24, "flags": 1},
+            {"matrix": [6, 0], "x": 223, "y": 41, "flags": 1}
         ],
         "sleep": true
     },