Revert "Poll on old Android versions"

This reverts commit 0f5e53040d.

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

@@ -662,9 +662,6 @@ public class ApplicationEx extends Application
         else if (version < 1994) {
             // 2022-10-28 Spamcop blocks Google's addresses
             editor.putBoolean("blocklist.Spamcop", false);
-        } else if (version < 2011) {
-            if (!prefs.contains("poll_interval"))
-                editor.putInt("poll_interval", 0);
         }
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !BuildConfig.DEBUG)

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

@@ -3233,9 +3233,8 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     }
 
     static int getPollInterval(Context context) {
-        int def = (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O ? 15 : 0);
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-        return prefs.getInt("poll_interval", def); // minutes
+        return prefs.getInt("poll_interval", 0); // minutes
     }
 
     static long[] getSchedule(Context context) {