Remove test_aot_dispatch_static* tests from opcheck tests (pytorch#2118)

Summary:

We missed a line in the original diff.

After Ed's D50886564, test_aot_dispatch_static and
test_aot_dispatch_dynamic are redundant, so we're just going to go with one
of them to reduce complexity and overall test times.

Reviewed By: williamwen42

Differential Revision: D51051732

Author: zou3519