[widgets][toolchaineditor] removed unwanted additional channel color

Fixes #267
4 jobs for 267_toolchain_additional_unwanted_channel_color in 20 minutes and 39 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build_linux_36 #201372
docker

00:10:08

90.0%
passed build_linux_37 #201373
docker

00:09:54

90.0%
passed build_macosx_36 #201370
macosx

00:20:39

90.0%
passed build_macosx_37 #201371
macosx

00:08:30

90.0%