fix(raidframes): fix absorb texture tiling

[manaste]

What does this PR do?

This PR fixes a bug where absorb texture tiling does not work as expected. The texture is stretched instead of being repeated.

The easiest way to reproduce this is to replace striped-thick.png with a smaller 32×32 version for testing:

The result is:

This apparently happens because StatusBar:SetStatusBarTexture does not set the texture's wrap mode to CLAMP. However, TextureBase:SetHorizTile and TextureBase:SetVertTile require the corresponding dimension's wrap mode to be REPEAT for tiling to work.

This PR introduces a helper function to work around this limitation. The function calls TextureBase:SetTexture with the appropriate wrap mode on the status bar's texture before calling TextureBase:SetHorizTile and TextureBase:SetVertTile.

Interestingly, this issue does not occur on unit frames, and I don't know why. No corresponding fix is required there.

How was it tested?

Tested on the live 12.1 client, build 9.0.7.

• Checked that tiling works with the replaced striped-thick.png texture.
• Checked that non-tiling textures continue to work as expected.

Checklist

• [n/a] New settings default OFF (no behavior change without opt-in)
• [n/a] Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built
• [n/a] Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• [n/a] No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• Tested in-game on live; no version gates or pre-Midnight APIs added