Fix 'Attached Issues' link on tag_view_page.php

After clicking the link, Mantis triggers SYSTEM WARNING: 'Invalid
argument supplied for foreach()' in 'gpc_api.php' line 259.

The root cause is actually an additional E_RECOVERABLE_ERROR (Argument 2
passed to gpc_get_string_array() must be of the type array, integer
given) which is thrown in search.php but hidden with default error
display settings.

Regression introduced by 5458f7020999317b35f403fa2a0e477d6182ec12.

This resolves the problem by changing the default value passed to
gpc_get_string_array() by search.php from (integer) 'META_FILTER_ANY'
to 'array( META_FILTER_ANY )'.

Fixes 0017517