Remove hard coded region

Region 'us-east-1' was hard coded in the SAM
config.This would not allow the customer to
deploy stack in some other region unless it
is changed in the config. Removing it will
ensure that the region is picked up from
developers aws config.

Author: saumehta9

Diff for: samconfig.toml

@@ -2,6 +2,5 @@ version = 0.1
 [default]
 [default.deploy]
 [default.deploy.parameters]
-region = "us-east-1"
 confirm_changeset = true
 capabilities = "CAPABILITY_NAMED_IAM"