Increased default connection timeout

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

@@ -126,7 +126,7 @@ public class EmailService implements AutoCloseable {
     static final int ENCRYPTION_STARTTLS = 1;
     static final int ENCRYPTION_NONE = 2;
 
-    final static int DEFAULT_CONNECT_TIMEOUT = 15; // seconds
+    final static int DEFAULT_CONNECT_TIMEOUT = 20; // seconds
     final static boolean SEPARATE_STORE_CONNECTION = false;
 
     private final static int SEARCH_TIMEOUT = 90 * 1000; // milliseconds

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

@@ -121,7 +121,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     private static final int OPTIMIZE_KEEP_ALIVE_INTERVAL = 12; // minutes
     private static final int OPTIMIZE_POLL_INTERVAL = 15; // minutes
     private static final int CONNECT_BACKOFF_START = 8; // seconds
-    private static final int CONNECT_BACKOFF_MAX = 8; // seconds (totally 8+2x15=38 seconds)
+    private static final int CONNECT_BACKOFF_MAX = 8; // seconds (totally 8+2x20=48 seconds)
     private static final int CONNECT_BACKOFF_ALARM_START = 15; // minutes
     private static final int CONNECT_BACKOFF_ALARM_MAX = 60; // minutes
     private static final long CONNECT_BACKOFF_GRACE = 2 * 60 * 1000L; // milliseconds