Fixed commons-app#3910 Truncated Spinners (commons-app#3911)

Wonderful, it works great in all screen sizes :-)

Author: madhurgupta10

app/src/main/res/layout/fragment_leaderboard.xml

@@ -18,14 +18,14 @@
     app:layout_constraintTop_toTopOf="parent">
 
     <Spinner
-      android:layout_marginStart="50dp"
+      android:layout_marginStart="20dp"
       android:id="@+id/duration_spinner"
       android:layout_width="match_parent"
       android:layout_weight="0.5"
       android:layout_height="match_parent" />
 
     <Spinner
-      android:layout_marginEnd="50dp"
+      android:layout_marginEnd="20dp"
       android:id="@+id/category_spinner"
       android:layout_width="match_parent"
       android:layout_weight="0.5"