fix courseware css file so it imports the right files in the right order

lms/static/sass/course.scss

@@ -10,18 +10,18 @@
 
 // Course styles
 @import 'course/courseware_subnav';
-@import 'module/module-styles.scss';
 
 // Courseware styles
 @import 'course/old/base/variables';
 @import 'course/old/base/extends';
 @import 'course/old/base/functions';
 
+@import 'module/module-styles.scss';
+
 @import 'course/old/courseware/courseware';
 @import 'course/old/courseware/sidebar';
 @import 'course/old/courseware/amplifier';
-
-@import 'course/old/courseware/problems';
+// @import 'course/old/courseware/problems';
 
 @import "course/old/info";