notes: add icons to use previous/next event as template

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

@@ -315,7 +315,9 @@ class MainActivity : AppCompatActivity() {
                 nextTextView.visibility = View.VISIBLE
                 nextTextView.setOnClickListener {
                     notesET.setText(nextEvent.notes)
+                    if (useQuantity) {
                         qtyET.setText(nextEvent.quantity.toString())
+                    }
                     update(nextEvent)
                 }
             } else {
@@ -326,7 +328,9 @@ class MainActivity : AppCompatActivity() {
                 prevTextView.visibility = View.VISIBLE
                 prevTextView.setOnClickListener {
                     notesET.setText(prevEvent.notes)
+                    if (useQuantity) {
                         qtyET.setText(prevEvent.quantity.toString())
+                    }
                     update(prevEvent)
                 }
             } else {
@@ -338,8 +342,10 @@ class MainActivity : AppCompatActivity() {
 
         clearTextView.setOnClickListener {
             notesET.setText("")
+            if (useQuantity) {
                 qtyET.setText("")
             }
+        }
 
         if (!useQuantity) {
             qtyET.visibility = View.GONE