Fix search with latest mariadb/mysql

Author: tintou

src/generator.vala

@@ -756,7 +756,7 @@ public class Valadoc.IndexGenerator : Valadoc.ValadocOrgDoclet {
     php.printf ("\t$res = mysqli_query($mysqli, \"SHOW TABLES\");\n");
     php.printf ("\t$pkgs = array();\n");
     php.printf ("\twhile ($row = $res->fetch_assoc()) {\n");
-    php.printf ("\t\t$pkgs[] = $row['Index'];\n");
+    php.printf ("\t\t$pkgs[] = $row['Table'];\n");
     php.printf ("\t}\n");
     php.printf ("\t$res->close ();\n");
     php.printf ("\t$allpkgs = implode(', ', $pkgs);\n\n");