stream-requirements: smoother matching in test-treemanifest.t

The value of `streamreqs` changes depending of the format used, but this is not
relevant for this tests. So we doing a smarter matching of the line to avoid
this test interfering with format changes in the future.

Differential Revision: https://phab.mercurial-scm.org/D12078

tests/test-treemanifest.t

@@ -829,11 +829,9 b' Packed bundle'
   $ hg -R deeprepo debugcreatestreamclonebundle repo-packed.hg
   writing 5330 bytes for 18 files (no-zstd !)
   writing 5400 bytes for 18 files (zstd !)
-  bundle requirements: generaldelta, revlogv1, sparserevlog, treemanifest (no-rust !)
-  bundle requirements: generaldelta, persistent-nodemap, revlogv1, sparserevlog, treemanifest (rust !)
+  bundle requirements:.* treemanifest(,.*)? (re)
   $ hg debugbundle --spec repo-packed.hg
-  none-packed1;requirements%3Dgeneraldelta%2Crevlogv1%2Csparserevlog%2Ctreemanifest (no-rust !)
-  none-packed1;requirements%3Dgeneraldelta%2Cpersistent-nodemap%2Crevlogv1%2Csparserevlog%2Ctreemanifest (rust !)
+  none-packed1;requirements%3D(.*%2C)?treemanifest(%2C.*)? (re)
 
 #endif