Dactyl Manuform 5x6, 5x7, and 6x6: QMK Configurator fixes and partial code clean-up (#5307)

* Tidy up 5x6.h

- replaced tabs with spaces (QMK convention)
- aligned layout macro visually

* Fix Configurator support for Dactyl Manuform 5x6

- layout macro had the wrong name in info.json

* Tidy up 5x7.h

- replaced tabs with spaces (QMK convention)
- aligned layout macro visually

* Fix Configurator support for Dactyl Manuform 5x7

- corrected keyboard height
- layout macro had the wrong name in info.json

* Tidy up 6x6.h

- replaced tabs with spaces (QMK convention)
- aligned layout macro visually

* Fix Configurator support for Dactyl Manuform 6x6

- layout macro had the wrong name in info.json

keyboards/handwired/dactyl_manuform/6x6/info.json

@@ -5,7 +5,7 @@
     "width": 17,
     "height": 9,
     "layouts": {
-        "LAYOUT": {
+        "LAYOUT_6x6": {
             "layout": [
                 {"label":"L00", "x":0, "y":0},
                 {"label":"L01", "x":1, "y":0},