update flake8 node_modules ignore pattern

Author: rmorshea

setup.cfg

@@ -13,7 +13,7 @@ max-line-length = 88
 max-complexity = 18
 select = B,C,E,F,W,T4,B9,N,ROH
 exclude =
-    src/idom/client/app/node_modules/*
+    **/node_modules/*
     .eggs/*
     .tox/*