codemirror: just use anyword autocomplete anywhere

codemirror python's completion just complete on builtins, so that hack is a bit better
(cherry picked from commit 926b0c71)

bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.xml

@@ -489,6 +489,11 @@
     lint: lint_option\n
     });\n
  //cm.foldCode(CodeMirror.Pos(8, 0));\n
+\n
+\n
+  CodeMirror.commands.autocomplete = function(cm) {\n
+    CodeMirror.showHint(cm, CodeMirror.hint.anyword, { "range": Infinity } );\n
+  }\n
 \n
  updateErrorWarningMessageDivWithJump();\n
 \n