Fix workspace update on branch checkout

Using simple mode in Studio with BM

Using User 1

• I create a branch "toto"
• I checkout on branch "toto"

Using User 2

• I checkout branch "toto"
• I make some modifications
• I checkout "master" branch
• I merge "toto" branch into "master" branch

Using User 1

• I checkout "master" branch
  => I need to pull the modifications made by User 2 in my workspace
  => In simple mode, a pull should be done automatically during checkout