fix pwm config for channel 4

[victor-Lopez25]

(thanks @FoniksFox)

[github-actions]

ST-LIB Release Plan

• Current version: 5.2.0
• Pending changesets: 4
• Highest requested bump: minor
• Next version if merged now: 5.3.0

Pending changes

• minor add an ethernet connected check (.changesets/add_check_ethernet.md)
• patch MPUDomain dynamic regions were configured using the linker symbol values instead of their addresses (that is the correct way of using linker symbols). That made non-cached regions cached, and caused harware undefined behaviour. (.changesets/hotfix-mpu-synamic-regions-linker-symbols.md)
• patch fix pwm channel 4 config in TimerWrapper (.changesets/hotfix-pwm-channel4.md)
• patch fix prescaler calculation in scheduler (.changesets/hotfix-sched-prescaler.md)

[FoniksFox]

I requested this change, I can confirm that it works now

[oganigl]

THANKS FONIKS