All `#` symbols are hidden in note list for a note, unless it's a `#sometext` (MD enabled)

### Expected
When Markdown is enabled, the hash symbol has to be hidden only in case when it's a header marker. In other words, hash(es) followed by space. Hash should still be shown for cases like:

`Hello, I'm note C#` ~> should be shown as `Hello, I'm note C#`

### Observed
`Hello, I'm note C#` is shown as `Hello, I'm note C`:

Note that hash is shown for cases when it's followed by text with no breaks.

### Reproduced
1. Create a new note
2. Enable Markdown for it
3. Add `Hello, I'm note C#` text
4. Look at the note list ~> it shows `Hello, I'm note C`

### Where did you see the bug

- OS: Windows
- OS version: 10
- Simplenote app version: 2.10.0-beta1

Reproduce the issue using the listed steps with Markdown enabled and `Hello, I'm note C#`. Trace the note-list Markdown handling and verify that header markers followed by spaces are hidden while the hash in `C#` remains visible; the issue is done when the note list shows the complete text.

Written by the indexing model from the issue text.