feat: Add scrollbars to habit overview list

References: #365

uhabits-android/src/main/res/layout/about.xml

@@ -132,6 +132,10 @@
                     style="@style/About.Item"
                     android:text="Victor Yu"/>
 
+                <TextView
+                    style="@style/About.Item"
+                    android:text="Christoph Hennemann"/>
+
             </LinearLayout>
 
             <LinearLayout

uhabits-android/src/main/res/values/attrs.xml

@@ -54,4 +54,6 @@
     <attr name="cardBackground" format="reference"/>
     <attr name="headerBackground" format="reference"/>
     <attr name="selectedBackground" format="reference"/>
+
+    <attr name="scrollableRecyclerViewStyle" format="reference"/>
 </resources>

uhabits-android/src/main/res/values/styles.xml

@@ -65,6 +65,8 @@
         <item name="aboutScreenColor">@color/blue_800</item>
         <item name="widgetShadowAlpha">0.25</item>
         <item name="widgetBackgroundAlpha">1</item>
+
+        <item name="scrollableRecyclerViewStyle">@style/ScrollableRecyclerViewStyle</item>
     </style>
 
     <style name="SmallSpinner">
@@ -120,6 +122,8 @@
 
         <item name="widgetShadowAlpha">0.25</item>
         <item name="widgetBackgroundAlpha">1</item>
+
+        <item name="scrollableRecyclerViewStyle">@style/ScrollableRecyclerViewStyle</item>
     </style>
 
     <style name="AppBaseThemeDark.PureBlack">
@@ -254,4 +258,8 @@
            parent="@style/Theme.AppCompat.Dialog">
         <item name="windowNoTitle">false</item>
     </style>
+
+    <style name="ScrollableRecyclerViewStyle" parent="android:Widget">
+        <item name="android:scrollbars">vertical</item>
+    </style>
 </resources>