Change position of variable declaration

app/assets/stylesheets/framework/variables.scss

@@ -363,6 +363,7 @@ $well-expand-item: #e8f2f7 !default;
 $well-inner-border: #eef0f2 !default;
 $well-light-border: #f1f1f1;
 $well-light-text-color: #5b6169;
+$nav-active-bg: var(--nav-active-bg, rgba($black, 0.08)) !important;
 
 /*
  * Text
@@ -475,7 +476,6 @@ $gl-line-height-18: 18px;
 $gl-line-height-20: 20px;
 $gl-line-height-24: 24px;
 $gl-line-height-14: 14px;
-$nav-active-bg: var(--nav-active-bg, rgba($black, 0.08)) !important;
 
 $pages-group-name-color: #4c4e54;