search: reset when screen is dismissed, even if it's still present under gview

Fixes #1725

docs/changelog.txt

@@ -42,6 +42,7 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 - `dwarfmonitor`: fixed a crash when opening the ``prefs`` screen if units have vague preferences
 - `embark-assistant`: fixed an issue causing incursion resource matching (e.g. sand/clay) to skip some tiles if those resources were provided only through incursions
 - `embark-assistant`: corrected river size determination by performing it at the MLT level rather than the world tile one
+- `search`: fixed an issue where search options might not display if screens were destroyed and recreated programmatically (e.g. with `quickfort`)
 - `zone`: fixed an issue causing the ``enumnick`` subcommand to run when attempting to run ``assign``, ``unassign``, or ``slaughter``
 
 ## Misc Improvements

plugins/search.cpp

@@ -97,7 +97,7 @@ void make_text_dim(int x1, int x2, int y)
 static bool is_live_screen(const df::viewscreen *screen)
 {
     for (df::viewscreen *cur = &gview->view; cur; cur = cur->child)
-        if (cur == screen)
+        if (cur == screen && cur->breakdown_level == interface_breakdown_types::NONE)
             return true;
     return false;
 }