server: compressed QMDL is decompressed in a zip

This is perhaps a bit silly, but the current output of a compressed
QmdlReader is always decompressed, so when we export a ZIP, we're
basically un-gzipping the QMDL before zipping it.

However, this approach makes for simpler code and results in a uniform
set of files for the user, which I think is worth the slight amount of
wasted processing.

daemon/src/server.rs

@@ -337,14 +337,14 @@ pub async fn get_zip(
 
             // Add QMDL file
             {
-                let extension = if compressed { "qmdl.gz" } else { "qmdl" };
                 let entry = ZipEntryBuilder::new(
-                    format!("{qmdl_idx}.{extension}").into(),
+                    format!("{qmdl_idx}.qmdl").into(),
                     Compression::Stored,
                 );
-                // FuturesAsyncWriteCompatExt::compat_write because async-zip's entrystream does
-                // not impl tokio's AsyncWrite, but only future's AsyncWrite. This can be removed
-                // once https://github.com/Majored/rs-async-zip/pull/160 is released.
+                // FuturesAsyncWriteCompatExt::compat_write because async-zip's
+                // entrystream does not impl tokio's AsyncWrite, but only
+                // future's AsyncWrite. This can be removed once
+                // https://github.com/Majored/rs-async-zip/pull/160 is released.
                 let mut entry_writer = zip.write_entry_stream(entry).await?.compat_write();
                 let qmdl_store = qmdl_store_lock.read().await;
                 let mut qmdl_reader = qmdl_store.open_entry_qmdl(entry_index).await?;