[3.12] gh-105557: Remove duplicate sqlite3 test method (GH-105558) (#105561)

test_func_return_too_large_int() was defined twice.
Keep only the redefined method, as that also checks the tracebacks.
(cherry picked from commit b8fa7bda4f286503447dc12327b789bbfc836458)

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>