Increase default keep alive interval to 19 minutes

.idea/misc.xml

@@ -25,7 +25,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -625,7 +625,7 @@ public class FragmentAccount extends FragmentEx {
                         if (TextUtils.isEmpty(password))
                             throw new Throwable(getContext().getString(R.string.title_no_password));
                         if (TextUtils.isEmpty(interval))
-                            interval = "12";
+                            interval = "19";
                         if (synchronize && drafts == null)
                             throw new Throwable(getContext().getString(R.string.title_no_drafts));
 

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

@@ -334,7 +334,7 @@
             android:id="@+id/etInterval"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="12"
+            android:hint="19"
             android:inputType="number"
             android:textAppearance="@style/TextAppearance.AppCompat.Medium"
             app:layout_constraintStart_toStartOf="parent"