bitbake: toaster: remove 2 confusing parameters

bitbake: toaster: remove 2 confusing parameters

Removed nobrowser and brbe script parameters as both
are confusing and nobrowser is not used anywhere.

brbe parameter usage can only be justified if toaster
doesn't work properly and user has to manually connect
toaster to running bitbake server. Even in this scenario
it's very unlikely to achieve as toaster script is not
designed for this kind of usage.

(Bitbake rev: 0fd04ede3fda6894d97a5ef830b79dbbc9c6cf51)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>