修改学生端UI bug

student/src/main/res/layout/fragment_mine_layout.xml

@@ -295,7 +295,6 @@
                 android:id="@+id/ll_mine_course"
                 android:layout_width="0dp"
                 android:layout_height="match_parent"
-                android:layout_marginLeft="20dp"
                 android:layout_weight="1"
                 android:gravity="center"
                 android:orientation="vertical">