Don't use -webkit-font-smoothing (#12029)

Don't change font smoothing via CSS. Linked issue has more details, but this seems fowned upon in general and a was also removed from standards track. Hopefully this will be a part of reverting to a native font stack for Gitea.

Fixes #11931

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/less/_base.less

@@ -134,7 +134,6 @@
 body {
     background-color: #ffffff;
     overflow-y: auto;
-    -webkit-font-smoothing: antialiased;
     display: flex;
     flex-direction: column;
 }