Update dependency howler to v2.2.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
howler (source)	2.2.1 -> 2.2.4

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Release Notes

goldfire/howler.js (howler)

v2.2.4

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• FIXED Invalid regex detection of Opera versions 100+ (#​1676).
• FIXED The pannerAttr method wouldn't set the values the first time it was called (#​1497).
• FIXED Error when refreshing the buffer on a sound that has already been unloaded (#​1508).

v2.2.3

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• FIXED Invalid regex detection of Opera versions 100+ (#​1676).
• FIXED The pannerAttr method wouldn't set the values the first time it was called (#​1497).
• FIXED Error when refreshing the buffer on a sound that has already been unloaded (#​1508).

v2.2.2

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The README has been updated with more examples and various clarifications. PRs/issues with suggestions for further improvements are appreciated.

• CHANGED Include keydown event when unlocking audio (#​1417).
• CHANGED The audio state is changed to loading while the player is buffering (#​1444).
• FIXED Looping sounds wouldn't always work correctly in recent versions of Firefox desktop (#​1445).
• FIXED Disabled WebM in Safari 14 until bug in Safari is resolved (#​1476).
• FIXED Error when calling seek() on audio that hasn't loaded (#​1423).
• FIXED Before a sound had loaded, calling pause() after seek() didn't have the intended behavior (#​1439).

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