src/MANIFEST.in: Fix 'exclude' line for tdlib

Author: Matthias Koeppe

src/MANIFEST.in

@@ -56,7 +56,7 @@ exclude sage/graphs/mcqd.p*
 exclude sage/libs/meataxe.p*
 exclude sage/libs/sirocco.p*
 exclude sage/matrix/matrix_gfpn_dense.p*
-exclude sage/graphs/graph_decomposition/tdlib.p*
+exclude sage/graphs/graph_decompositions/tdlib.p*
 
 # Exclude all__*.py files belonging to distributions related to optional packages
 global-exclude all__sagemath_bliss.py