spec: remove unit-test-style test from brandable_css_js_spec
spec: remove unit-test-style test from brandable_css_js_spec

refs CNVS-25916

This test case doesn't work with webpack (uses "require" dynamically in
a js console), and is actually covered by a unit test already anyway

spec/coffeescripts/util/brandableCssSpec.coffee:13

TEST PLAN:
 1) brandable_css_js_spec should pass on the webpack selenium build

Change-Id: Ied06954f4e52032e6fc427d080acc0892d74bb7a
Reviewed-on: https://gerrit.instructure.com/70315
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Jenkins
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
QA-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

grahamb/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,roxolan/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,redconfetti/canvas-lms,roxolan/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,redconfetti/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,SwinburneOnline/canvas-lms