fix: corne oled modifiers

[Diaoul]

There is a bug causing a visual glitch when multiple modifiers are pressed at the same time

Description

Fix it

Types of Changes

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

Issues Fixed or Closed by This PR

• None, I created the PR without issues first

Checklist

Does not apply

• [ ] 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).

[waffle87]

Looks like the rest of the splitkb/aurora keyboards also have this issue. If you're comfortable adding this fix to those, that would be welcome.

aurora/corne/corne.c:    if (modifiers & MOD_MASK_GUI & MOD_MASK_ALT) {
aurora/lily58/lily58.c:    if (modifiers & MOD_MASK_GUI & MOD_MASK_ALT) {
aurora/sofle_v2/sofle_v2.c:    if (modifiers & MOD_MASK_GUI & MOD_MASK_ALT) {
aurora/helix/helix.c:    if (modifiers & MOD_MASK_GUI & MOD_MASK_ALT) {
aurora/sweep/sweep.c:    if (modifiers & MOD_MASK_GUI & MOD_MASK_ALT) {

aurora/helix/helix.c:    if (modifiers & MOD_MASK_CTRL & MOD_MASK_SHIFT) {
aurora/corne/corne.c:    if (modifiers & MOD_MASK_CTRL & MOD_MASK_SHIFT) {
aurora/sweep/sweep.c:    if (modifiers & MOD_MASK_CTRL & MOD_MASK_SHIFT) {
aurora/sofle_v2/sofle_v2.c:    if (modifiers & MOD_MASK_CTRL & MOD_MASK_SHIFT) {
aurora/lily58/lily58.c:    if (modifiers & MOD_MASK_CTRL & MOD_MASK_SHIFT) {

[Diaoul]

Sure thing!