Fix upload dialog: search box button always searches

Previously when no IGDB matches were found, the button next to the
search box changed from 'Search' to 'Upload' after the first search.
Since the text is editable and users may want to refine their query,
this button should always trigger a search.

Upload is still available via:
- The 'Upload anyway as "..."' button (shown after failed search)
- The 'Use filename: ...' button at the bottom

frontend/src/pages/Library.svelte

@@ -194,10 +194,10 @@
                 placeholder="Search IGDB..."
                 bind:value={pendingTitle}
                 disabled={uploading || searching}
-                onkeydown={(e) => e.key === "Enter" && (manualSearched ? doUpload(pendingTitle.trim()) : handleManualSearch())}
+                onkeydown={(e) => e.key === "Enter" && handleManualSearch()}
               />
-              <button class="btn" onclick={manualSearched ? () => doUpload(pendingTitle.trim()) : handleManualSearch} disabled={uploading || searching || !pendingTitle.trim()}>
-                {uploading ? "Uploading..." : manualSearched ? "Upload" : "Search"}
+              <button class="btn" onclick={handleManualSearch} disabled={uploading || searching || !pendingTitle.trim()}>
+                {uploading ? "Uploading..." : "Search"}
               </button>
             </div>
             <button class="btn btn-secondary" onclick={() => doUpload(pendingFileName)} disabled={uploading}>