Use osdDisplayPIDValues() to draw pitch and roll PIDs

[fiam]

Saves 320 bytes of flash in F3

[fiam]

@shellixyz Take a look at this one, please.

[shellixyz]

Unfortunately it won't work correctly. The PID factors for pitch and roll can be adjusted simultaneously (ADJUSTMENT_PITCH_ROLL_P, ADJUSTMENT_PITCH_ROLL_I, ADJUSTMENT_PITCH_ROLL_D). With this mod the PID factors won't blink when pitch and roll are adjusted simultaneously. We could do this: shellixyz@6a7ea1b. Still saves 320 bytes.

I updated the commit I made a mistake.

[fiam]

@shellixyz Thanks! I've cherry-picked your commit and added it to this PR.