Mediaplayer card sending "media_play_pause" instead of "media_play"

[definitio]

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.

Describe the issue you are experiencing

I have a media player that supports Play and Stop. When pressing the Play button on the card the media_play_pause service is called instead of media_play. This causes the Play command to not work.

Describe the behavior you expected

Play button should call media_play service.

Steps to reproduce the issue

1. Add a mediaplayer that supports only Stop and Play (not Pause)
2. Navigate to Lovelace
3. Click Play, media_play_pause service is called

What version of Home Assistant Core has the issue?

2021.3.4

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue with?

Firefox 86.0.1

Which operating system are you using to run this browser?

Arch Linux

State of relevant entities

# Paste your state here.

Problem-relevant frontend configuration

# Paste your YAML here.

Javascript errors shown in your browser console/inspector

# Paste your logs here.

Button event:

{
    "event_type": "call_service",
    "data": {
        "domain": "media_player",
        "service": "media_play_pause",
        "service_data": {
            "entity_id": "media_player.vacuum"
        }
    },
    "origin": "LOCAL",
    "time_fired": "2021-03-19T12:19:30.581563+00:00",
    "context": {
        "id": "28c9d00eecb1dddea87c75525e3d919c",
        "parent_id": null,
        "user_id": "59507d5e859640a88b270a9bb00babe6"
    }
}

[mrand]

This has been a long standing problem - since before June of 2020 (per issue #6097, which expired with no response).