Update stylesheet imports in glitch components.

Commit cd59b66680 moved the Mastodon
variables and mixins deeper in the directory hierarchy; this commit
brings the glitch components in line with that change.

app/javascript/glitch/components/local_settings/navigation/item/style.scss

@@ -1,4 +1,4 @@
-@import 'styles/variables';
+@import 'styles/mastodon/variables';
 
 .glitch.local-settings__navigation__item {
   display: block;

app/javascript/glitch/components/local_settings/navigation/style.scss

@@ -1,4 +1,4 @@
-@import 'styles/variables';
+@import 'styles/mastodon/variables';
 
 .glitch.local-settings__navigation {
   background: $primary-text-color;

app/javascript/glitch/components/local_settings/page/item/style.scss

@@ -1,4 +1,4 @@
-@import 'styles/variables';
+@import 'styles/mastodon/variables';
 
 .glitch.local-settings__page__item {
   select {

app/javascript/glitch/components/local_settings/page/style.scss

@@ -1,4 +1,4 @@
-@import 'styles/variables';
+@import 'styles/mastodon/variables';
 
 .glitch.local-settings__page {
   display: block;

app/javascript/glitch/components/local_settings/style.scss

@@ -1,4 +1,4 @@
-@import 'styles/variables';
+@import 'styles/mastodon/variables';
 
 .glitch.local-settings {
   position: relative;