Speed up scbo tutorial (#1742)

Summary:
Use 2000 instead of 4000 candidates in order to lower the memory usage and also make the tutorial run faster

Pull Request resolved: #1742

Reviewed By: Balandat

Differential Revision: D44102135

Pulled By: dme65

fbshipit-source-id: 7d18abb17706e8cfedd4b0dca246585f8b7bc5f7

Author: dme65

scripts/run_tutorials.py

@@ -27,8 +27,6 @@
 RUN_IF_SMOKE_TEST_IGNORE_IF_STANDARD = {  # only used in smoke tests
     "thompson_sampling.ipynb",  # very slow without KeOps + GPU
     "composite_mtbo.ipynb",  # TODO: very slow, figure out if we can make it faster
-    # Timing out in standard mode
-    "scalable_constrained_bo.ipynb",
 }