[Test] Remove crappy characters

test/functional/messages/fws_fp.eml

@@ -8,13 +8,13 @@ X-Spam_report: Spam detection software, running on the system "www.kamailio.org"
  message has been attached to this so you can view it or label
  similar future email.  If you have any questions, see
  the administrator of that system for details.
-  
- Content preview:  Here�s an old one from 5 years ago. The principles remain
+
+ Content preview:  Here an old one from 5 years ago. The principles remain
     the same. https://www.fredposner.com/1457/kamailio-behind-nat/ -- fred [...]
- 
- 
+
+
  Content analysis details:   (-1.9 points, 5.5 required)
- 
+
   pts rule name              description
  ---- ---------------------- --------------------------------------------------
  -1.9 BAYES_00               BODY: Bayes spam probability is 0 to 1%

test/functional/messages/fws_tp.eml

@@ -8,13 +8,13 @@ X-Spam_report: Spam detection software, running on the system "www.kamailio.org"
  message has been attached to this so you can view it or label
  similar future email.  If you have any questions, see
  the administrator of that system for details.
-  
- Content preview:  Here�s an old one from 5 years ago. The principles remain
+
+ Content preview:  Here an old one from 5 years ago. The principles remain
     the same. https://www.fredposner.com/1457/kamailio-behind-nat/ -- fred [...]
 
- 
+
  Content analysis details:   (-1.9 points, 5.5 required)
- 
+
   pts rule name              description
  ---- ---------------------- --------------------------------------------------
  -1.9 BAYES_00               BODY: Bayes spam probability is 0 to 1%