disable boyscout_mode for eslint

flag = none

Test Plan:
-Jenkins passes
-Jenkins passes with eslint warning, -1 on gerrit lint review
-Jenkins passes with eslint error, -2 on gerrit lint review

Change-Id: I1eb3fed097e62eba726d5df18a958dc49c2ccdb2
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/287237
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
QA-Review: Ahmad Amireh <ahmad@instructure.com>
QA-Review: James Butters <jbutters@instructure.com>
Product-Review: James Butters <jbutters@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>

script/eslint

@@ -10,6 +10,7 @@ linter_options = {
   format: "eslint",
   command: "node_modules/.bin/eslint",
   campsite_mode: false,
+  boyscout_mode: false,
   append_files_to_command: true,
   comment_post_processing: proc do |comments|
     # This section should be removed when we start -2ing patchsets