[FIX] mail_quoted_reply: Use standard paragraph element to enter text

Without this, it is not possible to do a copy paste of a block of
text into the mail composer.

mail_quoted_reply/models/mail_message.py

@@ -10,11 +10,12 @@ class MailMessage(models.Model):
 
     def _prep_quoted_reply_body(self):
         return """
-            <div>
-                <br/>
+            <div style="margin: 0px; padding: 0px;">
+            <p style="margin:0px 0 12px 0;box-sizing:border-box;">
             <br />
+            </p>
             {signature}
-            </div>
+            <br />
             <br />
             <blockquote style="padding-right:0px; padding-left:5px; border-left-color: #000;
             margin-left:5px; margin-right:0px;border-left-width: 2px; border-left-style:solid">
@@ -23,6 +24,7 @@ class MailMessage(models.Model):
             {str_subject}: {subject}<br/>
             {body}
             </blockquote>
+            </div>
         """.format(
             email_from=self.email_from,
             date=format_datetime(self.env, self.date),