Start snooze activity after later is selected from lock screen (#840)

Fixes #787.

uhabits-android/src/main/AndroidManifest.xml

@@ -148,6 +148,7 @@
 
         <activity
             android:name=".notifications.SnoozeDelayPickerActivity"
+            android:taskAffinity=""
             android:excludeFromRecents="true"
             android:launchMode="singleInstance"
             android:theme="@android:style/Theme.Translucent.NoTitleBar" />

uhabits-android/src/main/java/org/isoron/uhabits/notifications/SnoozeDelayPickerActivity.kt

@@ -93,9 +93,4 @@ class SnoozeDelayPickerActivity : FragmentActivity(), OnItemClickListener {
         super.finish()
         overridePendingTransition(0, 0)
     }
-
-    override fun onPause() {
-        if (dialog != null) dialog!!.dismiss()
-        super.onPause()
-    }
 }