Update integration_tests/test_upgrade.py

Signed-off-by: mmsqe <mavis@crypto.com>

Author: mmsqe

integration_tests/test_upgrade.py

@@ -198,7 +198,6 @@ def do_upgrade(
     target0 = cli.block_height() + 15
     print("upgrade v0.7.0 height", target0)
     do_upgrade("v0.7.0", target0, "block", method="submit-proposal")
-    return
     cli = c.cosmos_cli()
 
     target1 = cli.block_height() + 15