Fix window not closing when using close mode instead of quit/hide

Author: qu1ck

src-tauri/capabilities/app.json

@@ -29,6 +29,7 @@
     "core:window:allow-show",
     "core:window:allow-hide",
     "core:window:allow-close",
+    "core:window:allow-destroy",
     "core:window:allow-set-size",
     "core:window:allow-set-position",
     "core:window:allow-set-focus",