Further increase widget corner radius to match current Android style

uhabits-android/src/main/java/org/isoron/uhabits/widgets/views/HabitWidgetView.kt

@@ -69,7 +69,7 @@ abstract class HabitWidgetView : FrameLayout {
         val shadowRadius = dpToPixels(context, 2f).toInt()
         val shadowOffset = dpToPixels(context, 1f).toInt()
         val shadowColor = Color.argb(shadowAlpha, 0, 0, 0)
-        val cornerRadius = dpToPixels(context, 12f)
+        val cornerRadius = dpToPixels(context, 18f)
         val radii = FloatArray(8)
         Arrays.fill(radii, cornerRadius)
         val shape = RoundRectShape(radii, null, null)

uhabits-android/src/main/res/drawable/widget_button_background.xml

@@ -28,7 +28,7 @@
 
             <item android:id="@android:id/mask">
                 <shape android:shape="rectangle">
-                    <corners android:radius="12dp"/>
+                    <corners android:radius="18dp"/>
                     <solid android:color="?android:colorPrimary"/>
                 </shape>
                 <color android:color="@color/white"/>