theme: Move endSessionDialog style into dialogs stylesheet

Since the style information of the end session dialog is now only a few
lines anymore, we can move it into the general stylesheet for dialogs.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/965

data/theme/gnome-shell-sass/_widgets.scss

@@ -13,7 +13,6 @@
 @import 'widgets/corner-ripple';
 @import 'widgets/dash';
 @import 'widgets/dialogs';
-@import 'widgets/end-session-dialog';
 @import 'widgets/entries';
 @import 'widgets/hotplug';
 @import 'widgets/ibus-popup';
@@ -36,4 +35,4 @@
 @import 'widgets/switches';
 @import 'widgets/tiled-previews';
 @import 'widgets/window-picker';
-@import 'widgets/workspace-switcher';
+@import 'widgets/workspace-switcher';

data/theme/gnome-shell-sass/widgets/_dialogs.scss

@@ -19,6 +19,15 @@
   @include fontsize($base_font_size + 3);
 }
 
+/* End Session Dialog */
+
+.end-session-dialog {
+  .end-session-dialog-battery-warning,
+  .dialog-list-title {
+    color: $warning_color;
+  }
+}
+
 /* Message Dialog */
 .message-dialog-content {
   spacing: 18px;

data/theme/gnome-shell-sass/widgets/_end-session-dialog.scss

@@ -1,12 +0,0 @@
-/* End Session Dialog */
-
-$end_session_dialog_width: 28em;
-
-.end-session-dialog-battery-warning {
-  width: $end_session_dialog_width;
-  color: $warning_color;
-}
-
-.end-session-dialog .dialog-list-title {
-  color: $warning_color;
-}

data/theme/meson.build

@@ -14,7 +14,6 @@ theme_sources = files([
   'gnome-shell-sass/widgets/_corner-ripple.scss',
   'gnome-shell-sass/widgets/_dash.scss',
   'gnome-shell-sass/widgets/_dialogs.scss',
-  'gnome-shell-sass/widgets/_end-session-dialog.scss',
   'gnome-shell-sass/widgets/_entries.scss',
   'gnome-shell-sass/widgets/_hotplug.scss',
   'gnome-shell-sass/widgets/_ibus-popup.scss',