Limited Number of Allowed Spawned Decal Actors

There is a relatively small number of decal actors which can spawn before all previously spawned decal actors disappear.

Also Reproduced in 4.7 Preview 4 and Main Promotable-CL-2412886

1. Open Attached AH_SpawnedDecalTest.uproject
2. PIE
3. Place decals by Clicking "F" in Editor

RESULTS: Between 35 to 50 decals all previous decals will disappear

EXPECTED: Previous Decals remain rendered, if performance hit no new decals should be spawnable