Fix styles for forgotten password link

Our secondary action links have a few context dependent
styles, so I've added a new one and I've pulled them
into their own file.

Also removed a duplicated import.

app/assets/scss/_brief_submission.scss

@@ -80,12 +80,3 @@ ol.steps {
    @extend %markdown-description;
    padding-bottom: 30px;
 }
-
-.secondary-action-link {
-    margin-top: 30px;
-}
-
-button.button-save + .secondary-action-link,
-input.button-save + .secondary-action-link {
-    margin-top: 5px;
-}

app/assets/scss/_secondary-action-link.scss

@@ -0,0 +1,13 @@
+.secondary-action-link {
+  margin-top: 30px;
+}
+
+.question + .secondary-action-link {
+  margin-top: -36px;
+  margin-bottom: 40px;
+}
+
+.button-save + .secondary-action-link,
+.button-save + .secondary-action-link-bigger {
+  margin-top: 5px;
+}

app/assets/scss/application.scss

@@ -42,7 +42,6 @@ $path: "/static/images/";
 @import "toolkit/forms/_textboxes.scss";
 @import "toolkit/forms/_validation.scss";
 @import "toolkit/search/_search-result.scss";
-@import "toolkit/_secondary-action-link.scss";
 
 #wrapper {
   @extend %site-width-container;
@@ -62,6 +61,7 @@ $path: "/static/images/";
 @import "_service-page.scss";
 @import "_index-page.scss";
 @import "_search-page.scss";
+@import "_secondary-action-link.scss";
 @import "_pagination.scss";
 @import "_publication.scss";
 @import "_supplier-a-to-z.scss";