buttons test modified

Author: yashsehgal

src/tests/__buttons.html

@@ -17,7 +17,7 @@
 
 
 <button class="et-button-secondary">Button</button>
-<button class="et-button-alert-secondary">Button</button>
+<button class="et-button-invalid-secondary">Button</button>
 <button class="et-button-warning-secondary">Button</button>
 <button class="et-button-valid-secondary">Button</button>
 </body>