Note file with ":" in file name does not save content

[krisdale]

1. Create new note (Notes>New).
2. Enter a title with a colon e.g. "this is: a test". Hit enter.
3. New note opens in tab, with the entered name "this is: a test.note"
   (Shows up in file system as "this is")
4. Enter content in ST editor/tab, save. While tab is still open, shows as having saved content, still shows file name of "this is: a test.note" on tab.
5. Close tab.
6. Will not show in Notes index. If you open in ST from file system, file name is different ("this is") and no content has been saved,