Fix BACKLIGHT_CAPS_LOCK warning

[zvecr]

Description

Non backlight keyboards are currently spitting out the following error:

Compiling: quantum/led.c                                                                           quantum/led.c:24:13: note: '#pragma message: Cannot use BACKLIGHT_CAPS_LOCK without backlight being enabled'
   24 | #    pragma message "Cannot use BACKLIGHT_CAPS_LOCK without backlight being enabled"
      |             ^~~~~~~
 [OK]
Compiling: 

Seems i let the some logic changes slip through when merging files.

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).