add dimensions to layouts

app/src/main/res/layout/fragment_options.xml

@@ -10,7 +10,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_margin="12dp">
+        android:layout_margin="@dimen/layout_margin">
 
         <Switch
             android:id="@+id/optSyncEnabled"

app/src/main/res/layout/fragment_privacy.xml

@@ -7,7 +7,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:padding="12dp">
+        android:layout_margin="@dimen/layout_margin">
 
         <TextView
             android:id="@+id/tvPrivacy"

app/src/main/res/values/dimens.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="layout_margin">12dp</dimen>
+</resources>