Fix download link in MySQL rows

https://forum.virtualmin.com/t/mariadb-download-link-when-viewing-text-database-fields/134323/14

mysql/view_table.cgi

@@ -391,7 +391,14 @@ if ($total || $in{'new'}) {
 				elsif ($displayconfig{'blob_mode'} &&
 				       &is_blob($str[$j]) && $c ne '') {
 					# Show download link for blob
-					push(@cols, &ui_link("download.cgi?db=$in{'db'}&table=$in{'table'}&start=$in{'start'}".$searchargs.$sortargs."&row=$i&col=$j",$text{'view_download'}));
+					push(@cols, &ui_link(
+						"@{[&get_webprefix()]}/".
+						  "$module_name/download.cgi?".
+						  "db=$in{'db'}&table=$in{'table'}".
+						  "&start=$in{'start'}".
+						  $searchargs.$sortargs.
+						  "&row=$i&col=$j",
+						$text{'view_download'}));
 					}
 				else {
 					# Just show text (up to limit)