Toggle Group button on map with single entity is not necessary

[erikgeurts]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Referring back to #24855 I'm afraid I have to report this is not yet resolved. I just updated to the most recent version of Home Assistant and I still see the Toggle group button.

When I have a map card that shows the geolocation of a single entity, the newly introduced Toggle Grouping button on the map could/should be hidden.

Having the button creates visual clutter, and it can cause confusion because clicking it appears to toggle something, yet nothing happens.

Describe the behavior you expected

Given the issue #24855 was closed with a PR that appears to be a bug fix, I had expected the toggle group button to disappear when there is only a single entity on a map.

Steps to reproduce the issue

...

What version of Home Assistant Core has the issue?

core 2025.5.3

What was the last working version of Home Assistant Core?

n/a

In which browser are you experiencing the issue?

all browsers and the Android app

Which operating system are you using to run this browser?

all OS's

State of relevant entities

n/a

Problem-relevant frontend configuration

type: map
entities:
  - entity: device_tracker.mower
theme_mode: auto
hours_to_show: 2
default_zoom: 19

Javascript errors shown in your browser console/inspector

none

Additional information

No response