Pre-declare variables before setting global.

[dj2]

Summary | Résumé

This PR fixes a warning which appears as the declaration and setting of
a variable !global is deprecated. This PR pre-declares the variable at
the top of the file allowing it to be made global later.

Issue #2052

[brdunfield]

Which warning does this fix? The only warning I see on my local build is about .File.Dir

[dj2]

Sorry, this is with newer Hugo. I'm trying to fix things that don't cause issues with old hugo.

DEPRECATION WARNING on line 1 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$primary-color: null` at the top level.

DEPRECATION WARNING on line 6 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$engagement-color: null` at the top level.

DEPRECATION WARNING on line 7 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$organizing-color: null` at the top level.

DEPRECATION WARNING on line 8 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$talent-color: null` at the top level.

DEPRECATION WARNING on line 9 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$design-color: null` at the top level.

DEPRECATION WARNING on line 10 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$foundations-color: null` at the top level.

DEPRECATION WARNING on line 11 of /Users/dj2/Development/cds/digital-canada-ca/assets/sass/engagement/_settings.scss:
!global assignments won't be able to declare new variables in future versions.
Consider adding `$yourthoughts-color: null` at the top level.

[brdunfield]

Ah yes, I was wondering if it was an older Hugo thing.
I looked in the current Sass docs and saw the rule about this - LGTM!