fix: improper usage of keyboard/user-level functions

[lesshonor]

Description

Correct several instances of keyboard-level code incorrectly calling (or neglecting to call) user-level functions.

• dumbpad/v1x_oled and rura66/rev1 call oled_task_user() for keyboard-level code.

• dumbpad/v1x_oled and lime/rev1 call encoder_update_user() for keyboard-level code.

• aeboards/ext65/rev2, mino_plus/* and horrortroll/lemon40 use the correct oled_task_kb(), but are missing the if (!oled_task_user()) clause allowing user overrides.

• Since I was already modifying the file: aeboards/ext65/rev2 calls keyboard_pre_init_user() only, instead of calling keyboard_pre_init_user() at the end of keyboard_pre_init_kb().

The diff looks more extensive than this because I ran qmk format-c on all affected files before making changes. I'm leaving the commits unsquashed so that's easier to see.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).