[RoboX2020]

Fixes #1050.

Collider::set_active_collision_types only assigned the field and never set a change flag, so the broad phase never re-tested the collider: a pair that the collision-types filter rejected at creation time (e.g. kinematic-fixed contacts, off by default) was never found again after the types were widened at runtime.

The fix inserts ColliderChanges::GROUPS when the value changes, mirroring set_collision_groups and set_solver_groups, so the broad phase re-tests the collider and the pair is created.

The included regression test (issue_1050_collision_types_change_flag.rs) uses the reproducer from the issue: a kinematic ball resting inside a fixed box, with types widened to ActiveCollisionTypes::all() after two steps. Verified locally:

• Without the fix: the new test fails exactly on the widen-after-start assertion (the from-the-start sanity check passes).
• With the fix: the new test passes; rapier3d lib tests 81/81, rapier2d lib tests 64/64, and the collision/broad-phase-related integration tests (broad_phase_pair_filter, collision_pipeline_moving_bodies, sleep_wake, sleep_wide_bodies, whole_island_sleep, contact_clustering, persistent_islands, query_pipeline_subshapes, issue_749, pipeline_counters) all pass.