issue: skin the modern filter Edit dialog for the Deepness theme (#8220)

* issue: skin the modern filter Edit dialog for the Deepness theme

The Deepness theme received the modern filter *bar* rules (#8219) but not
the .ui-dialog.cactiFilterDialog skin the other themes carry, so the filter
Edit dialog fell back to the default jQuery UI themeroller look (mismatched
titlebar gradient, unstyled buttonpane). Port the scoped dialog block used
by the other themes, using Deepness's emerald palette variables
(--dp-accent-deep titlebar/primary button, --dp-border buttonpane divider).

* issue#8220: reference PR number in CHANGELOG entry to satisfy the format gate

CHANGELOG

@@ -42,6 +42,7 @@ Cacti CHANGELOG
 -security#8158: Harden - Replace sibling password-reset links and revoke authentication state after reset
 -security#GHSA-3jj2-v5ch-wmq5: Fail closed on a posted LDAP realm that is not a configured domain
 -issue#8219: Fix the Deepness theme rendering the modern filter bar controls stacked vertically by porting the missing .filterRow/.filterColumn table-display rules from the other themes
+-issue#8220: Skin the modern filter Edit dialog (.ui-dialog.cactiFilterDialog titlebar/content/buttonpane) for the Deepness theme using its emerald palette so the dialog matches the theme instead of the default jQuery UI themeroller look
 -issue#8171: SNMPv3 devices using an auth/privacy protocol the running PHP cannot service natively (e.g. AES-256 before PHP 8.6) now collect through the Net-SNMP binary via a binary-delegating session instead of fataling the poller/device-edit, and the vendored classSNMP.php compatibility shim is removed
 -issue#8120: Do not replicate repository and tooling metadata files (.gitignore, .htaccess.dist, .mdl_style.rb, .mdlrc) to remote data collectors during file replication
 -issue#8116: Restore legacy unique_keys[] support in db_table_create() and db_update_table() so plugins that declare UNIQUE indexes with that definition style keep them across a schema refresh