Fix the Ampcor issues from Lijun's branch

[xhuang-jpl]

This PR is to fix the Ampcor issue

1. secondary window end pixel out of range in the across direction, at window (0, 686), pixel 27632 when the 20+5 data over Chile is processed. The runconfig of the dense_offset is

window_range: 64
window_azimuth: 128
half_search_range: 32
half_search_azimuth: 64
skip_range: 40
skip_azimuth: 75
correlation_surface_oversampling_factor: 16
deramping_method: complex

2. The unexpected results for different search windows.

[xhuang-jpl]

@lijun99 Thanks again for your PR, would you mind taking a look the merge? It seems that I cannot add you to be the reviewer.

[lijun99]

I tested the merged version and it works fine. Thanks @xhuang-jpl !

[xhuang-jpl]

I tested the merged version and it works fine. Thanks @xhuang-jpl !

Thanks @lijun99 , I also tested, and works fine on both CPU and GPU.