Fix code wrap for unbroken lines (go-gitea#23268)

## The Problem

`overflow-wrap: break-word` doesn't work well for unbroken lines. Use
`overflow-wrap: anywhere` instead, and remove legacy alias `word-wrap`

## Before


![image](https://user-images.githubusercontent.com/2114189/222743939-5f38d9e4-18d8-4ae0-8078-4b3a59195a30.png)

## After


![image](https://user-images.githubusercontent.com/2114189/222743833-0e0cfdbb-7b2e-420d-99f9-b1b45dde521a.png)

---------

Co-authored-by: silverwind <me@silverwind.io>

web_src/less/_base.less

@@ -2121,8 +2121,7 @@ a.ui.label:hover {
   font: 12px var(--fonts-monospace);
   white-space: pre-wrap;
   word-break: break-all;
-  overflow-wrap: break-word;
-  word-wrap: break-word;
+  overflow-wrap: anywhere;
 }
 
 .blame .code-inner {