Touchscreen calibration does not support rotated displays

[riban-bw]

Describe the bug
If the touch sensor is rotated with respect to the display, the touchscreen calibration fails.

To Reproduce
Steps to reproduce the behaviour:

1. Add a screen that has rotated display but not rotated touch interface, e.g. fb_ili9486
2. Admin / Calibrate Touchscreen

Expected behaviour
Touchscreen is calibrated

Actual behaviour
Touch detection is rotated from display.

Setup:

• HARDWARE
  Raspberry Pi 4 Model B Rev 1.1
  Soundcard: RBPi Headphones
  Display: Custom Device
  Wiring: MCP23017_ZynScreen
  GPIO Expander: Not detected
• SYSTEM
  Raspbian GNU/Linux 10 (buster)
  Build Date: 2021-09-25
  Memory: 4% (183M/3839M)
  SD Card: 19% (11G/59G)
  Temperature: 61.8ºC
• MIDI
  Profile: default.sh
  Fine Tuning: 440 Hz
  Master Channel: 16
  Single Active Channel: on
  ZS3 SubSnapShots: off
• SOFTWARE
  zyncoder: stable (7c09738)
  zynthian-ui: stable (4a08200)
  zynthian-sys: stable (a0e01eb)
  zynthian-data: stable (82571e7)
  zynthian-webconf: stable (7961552)

Additional context
I am working on a fix.

[riban-bw]

Implemented.