Fix "Total()" is called for dynamic pad

[yuanxion]

Details:

• Comment out pad.is_dynamic checking for "Total()" call

Tickets:

• CVS-157310

[yuanxion]

After comment out the "is_dynamic" checking for Pad, the dynamic model running does not crash when running on iGPU.

(Though the final generated image is all black, it may not be related to this PR because this all black image is also generated after reshaping this dynamic model to static)

[yuanxion]

After solving the "Total()" calling failure with commit e432370, 1 issue is the output result is still all-black image when running demo with OpenVINO models (quantized) on iGPU.

Checked that these OpenVINO models on CPU can get correct result.