Boston: correct LAYOUT macro data (#12282)

- correct macro reference
- add missing encoder position
- correct maintainer value to reference keyboard maintainer's GitHub account
- remove trailing whitespace

keyboards/boston/info.json

@@ -1,12 +1,13 @@
 {
     "keyboard_name": "boston",
     "url": "https://github.com/bluepylons/Boston",
-    "maintainer": "Pylon", 
+    "maintainer": "bluepylons",
     "width": 20.5,
     "height": 7.75,
     "layouts": {
-        "LAYOUT": {
+        "LAYOUT_all": {
             "layout": [
+                {"label":"Encoder", "x":0, "y":0},
                 {"label":"P1", "x":1.5, "y":0},
                 {"label":"P2", "x":2.5, "y":0},
                 {"label":"P3", "x":3.5, "y":0},
@@ -25,6 +26,7 @@
                 {"label":"Insert", "x":17.5, "y":0},
                 {"label":"Home", "x":18.5, "y":0},
                 {"label":"PgUp", "x":19.5, "y":0},
+
                 {"label":"Esc", "x":0, "y":1},
                 {"label":"F1", "x":1.5, "y":1},
                 {"label":"F2", "x":2.5, "y":1},
@@ -125,7 +127,6 @@
                 {"label":"3", "x":18.5, "y":5.5},
                 {"label":"Enter", "x":19.5, "y":5.5, "h":2},
 
-
                 {"label":"Ctrl", "x":0, "y":6.5, "w":1.25},
                 {"label":"OS", "x":1.25, "y":6.5, "w":1.25},
                 {"label":"Alt", "x":2.5, "y":6.5, "w":1.25},