fix(window): don't save the geometry of a minimised window

Windows parks a minimised window at -32000,-32000 with a stub size and reports
it as not-maximised, so closing OpsLog from the taskbar while minimised stored
exactly that. Seen in a log: "window: saving -32000,-32000 237x39
maximised=false".

The restore side already rejects both the impossible corner and the
below-minimum size, so nothing opened off-screen — but it fell back to the
default placement, and the operator silently lost the size, the position and the
maximised state they had set.

saveWindowState now keeps what was already stored when the window is minimised.
Two tests for that: the Wails flag, and the -32000 corner, because a window that
is mid-close can sit at that corner with the flag already cleared. A poisoned
window.json repairs itself on the next close of an on-screen window.

internal/award/catalog/rda.json

@@ -20,7 +20,10 @@
         "match_by": "description"
       }
     ],
-    "dxcc_filter": null,
+    "dxcc_filter": [
+      15,
+      54
+    ],
     "valid_bands": [
       "160m",
       "60m",
@@ -43,7 +46,7 @@
     ],
     "total": 0,
     "builtin": true,
-    "version": 1
+    "version": 2
   },
   "references": [
     {