fix(boards): Fix build warnings for Corne-ish Zen builds

[caksoylar]

Fixes warnings for two separate issues:

• Missed include for battery header in display widget, after the change in 6f8d080 (similar to f71458a that fixed it for nice!view)
  • Removed no-longer-used BAS header includes
    • Some other files (nice_view and stock battery widget) have these as well, but I can't test a build for these. If just making sure they build OK is fine I can add a commit for these too
• Disabled ZMK_USB in peripherals (didn't cause a build failure because it was forced off by its dependencies)

[petejohanson]

@caksoylar Mind including the header removal for the others? As long as it still builds (which it should), that should be fine.

[caksoylar]

Sure, will push it when I am home in the evening.

[caksoylar]

Pushed those too now, corne_left and right builds with OLED or nice!views seem to build OK here.

[petejohanson]

Thanks!