fix: heatmap layer - remove unused uniform blocks on mobile

[igorDykhta]

• the heatmap layer still crashes on some mobile devices
• the layer uniform block is removed from the compiled shader, but since it was never used, the GPU output is identical -> no crash on strict mobile compilers

For #3459

[Copilot]

Pull request overview

This PR addresses mobile shader compilation crashes in the deck.gl-based heatmap layer by ensuring an unused (but spec-invalid on some GLES compilers) uniform block is not injected into the heatmap’s transform shaders, while preserving identical GPU output.

Changes:

• Move the “weights” shader patching into _createWeightsTransform so it still applies when legacy AggregationLayer.updateState() bypasses getShaders for transform creation.
• Remove the layer shader module from the weights transform (and from the max-weights transform when detected) to avoid generating the problematic layerUniforms block on strict mobile GPU drivers.
• Keep the max-weights transform fragment shader patch in getShaders (forcing fragColor.r = 1.0) and pair it with the same module removal when applicable.

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