Added check to messaging

Proftaak Remote Healthcare/FietsClientV2/Forms/PatientForm.cs

@@ -120,7 +120,11 @@ namespace FietsClient
 
         private void messageBox_KeyPress(object sender, KeyPressEventArgs e)
         {
-            sendButton_Click(sender, e);
+            if (e.KeyChar == '\r')
+            {
+                sendButton_Click(sender, e);
+            }
+            
         }
 
         private void printMessage(string[] data)