Improve stripPrefixFromEntityName to handle colon and space separator

[bdr99]

Proposed change

I noticed that the Z-Wave JS integration (and possibly others) uses a colon and a space to separate device names from entity names. This causes the stripPrefixFromEntityName logic to fail because it is expecting just a space. This has the undesired effect of the full entity names being shown on the device page:

This PR expands stripPrefixFromEntityName to strip the prefix regardless of whether it is separated by a space, or a colon and a space. This improves the UX by shortening the displayed entity names:

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io