fix(pointing): Complete header rename missed in refactor

[petejohanson]

• Update a few mouse.h -> pointing.h missed refactors.

PR check-list

• Branch has a clean commit history
• Additional tests are included, if changing behaviors/core code that is testable.
• Proper Copyright + License headers added to applicable files (Generally, we stick to "The ZMK Contributors" for copyrights to help avoid churn when files get edited)
• Pre-commit used to check formatting of files, commit messages, etc.

[caksoylar]

There's also a non-renamed Kconfig in

zmk/app/tests/pointing/mkp/native_posix_64.conf

Line 6 in 6b40bfd

CONFIG_ZMK_MOUSE=y

if you want to add onto this.

[petejohanson]

There's also a non-renamed Kconfig in

zmk/app/tests/pointing/mkp/native_posix_64.conf

Line 6 in 6b40bfd

CONFIG_ZMK_MOUSE=y

if you want to add onto this.

Ironically, I had changed this to test that our backwards compat for that symbol worked... and forgot to change it back. Good catch. Thanks.