Remove mixed block35 fp16 variants superseded by full-model conversions

diffusion_models/seedvr2_7b_fp8_e4m3fn_mixed_block35_fp16.safetensors

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diffusion_models/seedvr2_7b_mxfp8_mixed_block35_fp16.safetensors

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diffusion_models/seedvr2_7b_nvfp4_mixed_block35_fp16.safetensors

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diffusion_models/seedvr2_7b_sharp_fp8_e4m3fn_mixed_block35_fp16.safetensors

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diffusion_models/seedvr2_7b_sharp_mxfp8_mixed_block35_fp16.safetensors

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diffusion_models/seedvr2_7b_sharp_nvfp4_mixed_block35_fp16.safetensors

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