fix: prevent trashing of trashed assets (#10028)

* fix: prevent trashing of trashed assets

Motivation
----------
This will improve user experience by hiding a pointless action.

You can not trash a trashed asset again. It won't get any trashier than it already is.

How to test
-----------
1. Visit route `/trash`
2. Click on an asset
3. Press "Delete" on your keyboard
4. Nothing happens
5. Try to find the trash button in the top right
6. You can't find it

* refactor: follow @michelheusschen's review

See:
https://github.com/immich-app/immich/pull/10028#pullrequestreview-2105296755

* refactor:  follow @michelheusschen's 2nd review

See: https://github.com/immich-app/immich/pull/10028#discussion_r1632057833

web/src/lib/components/asset-viewer/asset-viewer.svelte

@@ -543,7 +543,7 @@
     { shortcut: { key: 'ArrowLeft' }, onShortcut: () => navigateAsset('previous') },
     { shortcut: { key: 'ArrowRight' }, onShortcut: () => navigateAsset('next') },
     { shortcut: { key: 'd', shift: true }, onShortcut: () => downloadFile(asset) },
-    { shortcut: { key: 'Delete' }, onShortcut: () => trashOrDelete(false) },
+    { shortcut: { key: 'Delete' }, onShortcut: () => trashOrDelete(asset.isTrashed) },
     { shortcut: { key: 'Delete', shift: true }, onShortcut: () => trashOrDelete(true) },
     { shortcut: { key: 'Escape' }, onShortcut: closeViewer },
     { shortcut: { key: 'f' }, onShortcut: toggleFavorite },
@@ -579,6 +579,7 @@
           on:showDetail={showDetailInfoHandler}
           on:download={() => downloadFile(asset)}
           on:delete={() => trashOrDelete()}
+          on:permanentlyDelete={() => trashOrDelete(true)}
           on:favorite={toggleFavorite}
           on:addToAlbum={() => openAlbumPicker(false)}
           on:restoreAsset={() => handleRestoreAsset()}