Jrnl: Journal templates don't expand user path

[wren]

Bug Report

Environment

• Jrnl version:
• Install method:
• OS
  Likely all versions.

Current Behavior

~/template.md doesn't work for a template file. Has this error:
[Could not read template at '~/template.md']

Expected Behavior

The ~ should be expanded the same way it is for journal file themselves.

Repro Steps

Other Information

Current workaround is to use the full path to a file (e.g. /Users/wren/template.md) instead.

[wren]

There might be other instances of this behavior throughout the code, so the fix for this should include a simple function to handle properly expanding paths, and change all instances in the codebase to use this new function.

[MinchinWeb]

704 solved a similar problem in the upgrade script.

The added code was:

path = os.path.expanduser(path)