Test Branch: can't select layers properly.

[MrDham]

Describe the bug
Testing UI on test branch after fix of #360.
I can't select any other layer than the 1st created one.

To Reproduce
Steps to reproduce the behavior:

1. Create 2 layers
2. Select layer 1 -> You are in Layer 1 "control"
3. Back until you are in layer list
4. Select layer 2 -> You are in Layer 1 "control"
5. Push Layer -> You stay in layer 1 "control"

Expected behavior
2. Select layer 2 -> You are in Layer 2 "control"
4. Push Layer -> You change of layer "control"

Screenshots
I can get if required

Setup:

• SD-image
  Build Date: 2020-09-05

• Hardware Config
  Raspberry Pi 3 Model B Plus Rev 1.3
  Soundcard: HifiBerry DAC+
  Display: PiScreen 3.5 (v2)
  Wiring: MCP23017_EXTRA
  GPIO Expander: MCP23017

• Software Version
  zyncoder: testing (d852c8f)
  zynthian-ui: testing (1894310)
  zynthian-sys: testing (9b6ead4)
  zynthian-data: testing (194fd59)
  zynthian-webconf: testing (33699a7)

Additional context
Test branch.

[MrDham]

Oups, it is already on discourse... I hope I didn't create a duplicate.

[jofemodo]

I just pushed a fix on testing branch,
This bug has been introduced by recent changes. It should be tested carefully and merged on stable with next hotfixes.