pytests: test_touch: exclude Evergreen from firmware version check

It has a different panel and the firmware seems to be different there.
3 jobs for all_boards in 4 minutes and 13 seconds (queued for 7 seconds)
latest
Status Job ID Name Coverage
  Build
passed #313886
librem5
build:deb

00:01:57

 
  Test
passed #313887
librem5
test:download:deb

00:02:07

passed #313888
librem5
test:download:pip

00:02:13