adding vendor prefixes for appearance before build for testing, as appearance...

adding vendor prefixes for appearance before build for testing, as appearance is not widely supported

opentech/static_src/src/sass/components/_form.scss

@@ -81,8 +81,9 @@
         select {
             background: transparent;
             border-radius: 0;
-            appearance: none; // sass-lint:disable-line
-
+            appearance: none;
+            -webkit-appearance: none; // sass-lint:disable-line no-vendor-prefixes
+            -moz-appearance: none; // sass-lint:disable-line no-vendor-prefixes
 
             option {
                 background-color: white;