Specify widget target cell sizes

app/src/main/res/xml-v31/widget.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:configure="eu.faircode.email.ActivityWidget"
+    android:initialLayout="@layout/widget_new"
+    android:previewImage="@drawable/widget_preview_new"
+    android:resizeMode="horizontal|vertical"
+    android:targetCellWidth="1"
+    android:targetCellHeight="1"
+    android:updatePeriodMillis="0"
+    android:widgetCategory="home_screen"
+    android:widgetFeatures="reconfigurable" />

app/src/main/res/xml-v31/widget_sync.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:configure="eu.faircode.email.ActivityWidgetSync"
+    android:initialLayout="@layout/widget_sync"
+    android:previewImage="@drawable/widget_preview_sync"
+    android:resizeMode="horizontal|vertical"
+    android:targetCellWidth="1"
+    android:targetCellHeight="1"
+    android:updatePeriodMillis="0"
+    android:widgetCategory="home_screen"
+    android:widgetFeatures="reconfigurable" />

app/src/main/res/xml-v31/widget_unified.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:configure="eu.faircode.email.ActivityWidgetUnified"
+    android:initialLayout="@layout/widget_unified"
+    android:previewImage="@drawable/widget_preview_unified"
+    android:resizeMode="horizontal|vertical"
+    android:targetCellWidth="2"
+    android:targetCellHeight="2"
+    android:updatePeriodMillis="0"
+    android:widgetCategory="home_screen"
+    android:widgetFeatures="reconfigurable" />