Update CM SHA to include "one pixel wide selection on empty lines".

RaymondLim · RaymondLim · commit 057ab620b215 · 2014-06-23T12:11:32.000-07:00
diff --git a/src/thirdparty/CodeMirror2 b/src/thirdparty/CodeMirror2
@@ -1 +1 @@
-Subproject commit 685061675b5ce26a9b19b1d18f542710cae57364
+Subproject commit 64bee5830b6f838c2c9be6dded98a5dac794dbcd
