MainActivity: inline nested function for dynamic menu

Make the UI more flexible and
slightly easier to understand.

app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt

@@ -493,6 +493,11 @@ class MainActivity : AppCompatActivity() {
             updateFields()
         }
 
+        sleepStart = adjustToMinute(pickedDateTimeBegin.time.time / 1000)
+        sleepEnd = adjustToMinute(pickedDateTimeEnd.time.time / 1000)
+
+        updateFields()
+
         if (showTime) {
             dateDelimiter.visibility = View.GONE
             datePickerEnd.visibility = View.GONE
@@ -507,11 +512,6 @@ class MainActivity : AppCompatActivity() {
             d.setMessage(event.getDialogMessage(this))
         }
 
-        sleepStart = adjustToMinute(pickedDateTimeBegin.time.time / 1000)
-        sleepEnd = adjustToMinute(pickedDateTimeEnd.time.time / 1000)
-
-        updateFields()
-
         durationMinus5Button.setOnClickListener {
             sleepEnd = (sleepEnd - 300).coerceAtLeast(sleepStart)
             updateFields()