ci: set nodejs version for tests outside fold

ci/run_tests.sh

@@ -17,12 +17,12 @@ build_nvim
 
 exit_suite --continue
 
-enter_suite tests
-
 source ~/.nvm/nvm.sh
 nvm use 10
 export TREE_SITTER_DIR=$HOME/tree-sitter-build/
 
+enter_suite tests
+
 if test "$CLANG_SANITIZER" != "TSAN" ; then
   # Additional threads are only created when the builtin UI starts, which
   # doesn't happen in the unit/functional tests