Fix default reminder preference

app/src/androidTest/java/org/tasks/preferences/PreferenceTests.kt

@@ -116,6 +116,16 @@ class PreferenceTests {
         assertEquals(dueDate, preferences.adjustForQuietHours(dueDate))
     }
 
+    @Test
+    fun testDefaultReminders() {
+        assertEquals(0, defaultReminders())
+        assertEquals(2, defaultReminders(1))
+        assertEquals(4, defaultReminders(2))
+        assertEquals(6, defaultReminders(1, 2))
+        assertEquals(32, defaultReminders(5))
+        assertEquals(38, defaultReminders(1, 2, 5))
+    }
+
     private fun setQuietHoursStart(hour: Int) {
         preferences.setInt(R.string.p_rmd_quietStart, hour * MILLIS_PER_HOUR)
     }
@@ -124,6 +134,14 @@ class PreferenceTests {
         preferences.setInt(R.string.p_rmd_quietEnd, hour * MILLIS_PER_HOUR)
     }
 
+    private fun defaultReminders(vararg values: Int): Int {
+        preferences.setStringSet(
+            R.string.p_default_reminders_key,
+            values.map { it.toString() }.toSet()
+        )
+        return preferences.defaultReminders
+    }
+
     companion object {
         @SuppressLint("NewApi")
         private val MILLIS_PER_HOUR = TimeUnit.HOURS.toMillis(1).toInt()

app/src/main/java/org/tasks/preferences/Preferences.kt

@@ -203,7 +203,7 @@ class Preferences @JvmOverloads constructor(
     val defaultReminders: Int
         get() = defaultRemindersSet
             .mapNotNull { it.toIntOrNull() }
-            .sum()
+            .fold(0) { v, e -> v or (1 shl e) }
 
     val defaultRingMode: Int
         get() = getIntegerFromString(R.string.p_default_reminders_mode_key, 0)