Bugfix: Backflush not stopping when Brew-trigger configured

[genkigenki]

Bugfix for Backflush not stopping when having Brew-switch configured as trigger: Fixes behaviour for brewtrigger. Adds one debug message for website-abort and extends debug message for backflush to include the backflush counter.

Bug:

• Configure brew switch as trigger
• Switch on Backflush via Webinterface
• Start Backflush with Brew-Trigger
• Backflush runs & finishes, stops at "press brewswitch to stop", even though mechanical brew trigger is off Effect:
• When switching off Backflush via Webinterface, Display jumps between "normal Display" and "Backflush Display"

Desired outcome:

• Backflush jumps back to "press brew to start" once backflush-cycle is complete