Update git submodules

* Update plugins/codemirror-editor from branch 'master'
  to 53dccff17c029459999ff70ac886b80626af634b
  - fix path to codemirror-assets.html
    
    Bug: Issue 9060
    Change-Id: I7c3604ace0e013de8b5ef3e018299f6755e3dcf4
    
diff --git a/plugins/codemirror-editor b/plugins/codemirror-editor
index ee50e45..53dccff 160000
--- a/plugins/codemirror-editor
+++ b/plugins/codemirror-editor
@@ -1 +1 @@
-Subproject commit ee50e45b449e282ed78917175daf8b359da8d943
+Subproject commit 53dccff17c029459999ff70ac886b80626af634b