Display "" instead of 0.

(cherry picked from commit 154d5f7abfb18cedfd28a61b3242951d62f2e6b4)

FreeAPS/Sources/Views/DecimalTextField.swift

@@ -67,7 +67,9 @@ struct DecimalTextField: UIViewRepresentable {
         let coordinator = context.coordinator
         if coordinator.isEditing {
             coordinator.resetEditing()
-        } else /* if value != 0 */ {
+        } else if value == 0 {
+            textField.text = ""
+        } else {
             textField.text = formatter.string(for: value)
         }
     }