[Regression] Blur/feather effects render coarser since 11.2.0 #442

Description

Animations using blur (feather) effects render noticeably less smooth since 11.2.0. The blur appears chunky/coarse compared to the smooth output on 11.1.0.

Version	Screenshot
11.1.0 (smooth)
11.2.0 (coarse)

Versions, Device, and Other Information

• Rive Android Runtime Version: 11.2.0 (regression from 11.1.0)

• Rive API: Legacy (RiveAnimationView)

• Device: Android Emulator (arm64-v8a)

• App Minimum SDK Level: 21

• App Target SDK Level: 36

• Frequency: Every time

• Other Rive runtimes affected: React Native
  (rive-nitro-react-native#187)

Reproduction Steps

1. Open the rive-android example app
2. Navigate to Android Player
3. Add R.raw.feather to the animationResources list in AndroidPlayerActivity
4. Select feather from the resource dropdown
5. Observe the blur effects are coarser/chunkier than on 11.1.0

Use the .riv file from here:
https://rive.app/community/files/26935-50620-feather

Source .riv/.rev File

https://rive.app/community/files/26935-50620-feather

Expected Behavior

Blur/feather effects should render smoothly, as they did on 11.1.0.

Screenshots

Version	Screenshot
11.1.0 (smooth)
11.2.0 (coarse)

Additional context

• Bisected to commit [98b10d50](98b10d50ae3b28
  707451bf8a61a3959b97b32cea) ("Optimized feather (#11625) — Convert to Float16")
• iOS is not affected