[PyPer][BE] Fix test_scripted_module in StatCollector (#108232)
Summary: D41985889 removed the cast to int for the inputs to torch.histc below, allowing the inputs to still be tensors. These tensors still have require_grad_ set to True, causing issues with the call to torch.histc.
Test Plan: buck2 test 'fbcode//mode/opt' fbcode//dper3/dper3/modules/low_level_modules/tests:stat_collector_test -- --exact 'dper3/dper3/modules/low_level_modules/tests:stat_collector_test - test_scripted_module (dper3.dper3.modules.low_level_modules.tests.stat_collector_test.StatCollectorTest_1)'
Differential Revision: D48800879
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108232
Approved by: https://github.com/jerryzh168
