fileserver: Add .m4v for browse template icon

Author: mholt

modules/caddyhttp/fileserver/browse.html

@@ -31,7 +31,7 @@
 			<path d="M14 14l1 -1c.928 -.893 2.072 -.893 3 0l3 3"/>
 		</svg>
 		{{- end}}
-	{{- else if .HasExt ".mp4" ".mov" ".mpeg" ".mpg" ".avi" ".ogg" ".webm" ".mkv" ".vob" ".gifv" ".3gp"}}
+	{{- else if .HasExt ".mp4" ".mov" ".m4v" ".mpeg" ".mpg" ".avi" ".ogg" ".webm" ".mkv" ".vob" ".gifv" ".3gp"}}
 	<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-movie" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
 		<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
 		<path d="M4 4m0 2a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2z"/>