Tango: Open: use small launcher image for old databases without preview image

app/android/res/layout/database_list.xml

@@ -6,8 +6,8 @@ android:background="#fff">
 
 <ImageView
 android:id="@+id/imageView"
-android:layout_width="150dp"
-android:layout_height="150dp"
+android:layout_width="@dimen/image_width"
+android:layout_height="@dimen/image_width"
 android:layout_marginLeft="10dp"
 android:padding="5dp"
 android:src="@drawable/ic_launcher" />

app/android/res/values/dimens.xml

@@ -0,0 +1,4 @@
+
+    <resources>
+        <dimen name="image_width">150dp</dimen>
+    </resources>