yev-kanivets#138[30m]. Fix a bug with 'add buttons'.

Author: Evgenii Kanivets

app/src/main/res/drawable/selector_add_income.xml

@@ -2,4 +2,4 @@
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="false" android:drawable="@color/green_light"/>
     <item android:state_pressed="true" android:drawable="@color/green_dark"/>
-</selector>
+</selector>

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

@@ -24,17 +24,16 @@
 
         <Button
             android:id="@+id/btn_add_income"
-            android:layout_width="match_parent"
+            android:layout_width="0dp"
             android:layout_height="wrap_content"
-            android:layout_gravity="end"
             android:layout_weight="1"
             android:background="@drawable/selector_add_income"
             android:padding="@dimen/normal_margin"
             android:text="@string/add_income" />
 
         <Button
             android:id="@+id/btn_add_expense"
-            android:layout_width="match_parent"
+            android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:background="@drawable/selector_add_expense"