Fixed black background in scoreboard tables

Author: DreierF

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

@@ -17,6 +17,8 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
 
+    <solid android:color="#00FFFFFF"/>
+
     <padding
         android:bottom="1dp"
         android:left="1dp"