adjust regexp

test-normalizer.sed

@@ -6,5 +6,5 @@ s/subgoal/goal/g
 /^File/d
 # extra space removed in https://github.com/coq/coq/pull/16130
 s/= $/=/
-# coq/coq#16208 (this regex deletes an empty line followed by the "uses section variable" line)
-/^$/{N;/.* uses section variable.*/d}
+# delete "uses section variable" lines (https://github.com/coq/coq/pull/16208)
+/^[^ ]+ uses section variables? .*\.$/d