Update compression test to manually choose best compression level

 * The test code was built assuming that brotli would be running using best compression level.  Since this is no longer the case by default, the test code has been updated to set it manually.

tower-http/src/compression/layer.rs

@@ -146,7 +146,10 @@ mod tests {
 
     #[tokio::test]
     async fn accept_encoding_configuration_works() -> Result<(), crate::BoxError> {
-        let deflate_only_layer = CompressionLayer::new().no_br().no_gzip();
+        let deflate_only_layer = CompressionLayer::new()
+            .quality(CompressionLevel::Best)
+            .no_br()
+            .no_gzip();
 
         let mut service = ServiceBuilder::new()
             // Compress responses based on the `Accept-Encoding` header.
@@ -173,7 +176,10 @@ mod tests {
 
         let deflate_bytes_len = bytes.len();
 
-        let br_only_layer = CompressionLayer::new().no_gzip().no_deflate();
+        let br_only_layer = CompressionLayer::new()
+            .quality(CompressionLevel::Best)
+            .no_gzip()
+            .no_deflate();
 
         let mut service = ServiceBuilder::new()
             // Compress responses based on the `Accept-Encoding` header.