build: Fix Makefile.am TOR_RUST_STATIC_NAME variable name after revert.

 * FIXES #25341: https://bugs.torproject.org/25341

Makefile.am

@@ -26,7 +26,7 @@ TESTING_TOR_BINARY=$(top_builddir)/src/or/tor$(EXEEXT)
 endif
 
 if USE_RUST
-rust_ldadd=$(top_builddir)/src/rust/target/release/@TOR_RUST_UTIL_STATIC_NAME@
+rust_ldadd=$(top_builddir)/src/rust/target/release/@TOR_RUST_STATIC_NAME@
 else
 rust_ldadd=
 endif