Fix css style format for button of marketing email

Closes #14451
(grafted from 817136daa763a8da01a8a8f80c5113c86564000d)

--HG--
branch : 6.0

modules/marketing_email/email_subscribe.html

@@ -21,7 +21,7 @@
                     <input type="hidden" name="${name}" value="${value}"/>
                     </py:for>
                     <button type="submit"
-                            style="cursor: pointer
+                            style="cursor: pointer;
                             padding: 0.5em 1em; font-size: 2em;
                             border: 1px solid #2E6DA4; border-radius: 4px;
                             color: #FFF; background-color: #337AB7;">

modules/marketing_email/email_unsubscribe.html

@@ -21,7 +21,7 @@
                     <input type="hidden" name="${name}" value="${value}"/>
                     </py:for>
                     <button type="submit"
-                            style="cursor: pointer
+                            style="cursor: pointer;
                             padding: 0.5em 1em; font-size: 2em;
                             border: 1px solid #2E6DA4; border-radius: 4px;
                             color: #FFF; background-color: #337AB7;">