Replace src with raw to fix image paths (#4377)

Signed-off-by: Jonas Franz <info@jonasfranz.software>

modules/markup/markdown/markdown.go

@@ -101,7 +101,7 @@ var (
 func (r *Renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
 	prefix := r.URLPrefix
 	if r.IsWiki {
-		prefix = util.URLJoin(prefix, "wiki", "src")
+		prefix = util.URLJoin(prefix, "wiki", "raw")
 	}
 	prefix = strings.Replace(prefix, "/src/", "/raw/", 1)
 	if len(link) > 0 {