Better fix for rigid body not resimulating

Last fix only accounted for direct changes to the RB settings, but
failed for, say, object transformations. This fix accounts for any
change that might invalidate the RB cache.

source/blender/blenkernel/intern/rigidbody.c

@@ -1517,7 +1517,6 @@ void BKE_rigidbody_cache_reset(RigidBodyWorld *rbw)
 {
 	if (rbw) {
 		rbw->pointcache->flag |= PTCACHE_OUTDATED;
-		rbw->ltime = rbw->pointcache->startframe;
 	}
 }
 
@@ -1580,6 +1579,10 @@ void BKE_rigidbody_do_simulation(Scene *scene, float ctime)
 	// RB_TODO deal with interpolated, old and baked results
 	bool can_simulate = (ctime == rbw->ltime + 1) && !(cache->flag & PTCACHE_BAKED);
 
+	if (cache->flag & PTCACHE_OUTDATED || cache->last_exact == 0) {
+		rbw->ltime = cache->startframe;
+	}
+
 	if (BKE_ptcache_read(&pid, ctime, can_simulate)) {
 		BKE_ptcache_validate(cache, (int)ctime);
 		return;