Fix Do not animate spoilers if system animations are disabled.

[Sgn-32]

Contributor checklist

• I am following the Code Style Guidelines
• I have tested my contribution on these devices:

• Virtual Pixel XL, Android 12

• My contribution is fully baked and ready to be merged as is

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Description

The commit 272860f in 6.24.1 disables the animation of spoilers if system animations are disabled.
When system animations are disabled the draw function

Signal-Android/app/src/main/java/org/thoughtcrime/securesms/components/spoiler/SpoilerPaint.kt

Line 107 in 272860f

private fun draw(canvas: Canvas, dt: Long) {

is executed anyway, although the values of the particles do not change, due to dt = 0.

This PR changes this. The update function is called onetime (in the init with update(true)) to compute a spoiler particles image.
Every other call of update() is directly returned, if system animations are disabled.

[Sgn-32]

Screenshot of first PR. I will post a second PR soon.
The spoiler animation is stopped now by stopping the time animator, if system animation is disabled.

[Sgn-32]

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