[MASTER] Fix make_bs_regtest

We want to call the script itself instead of bash, because the script is part of the sudoers.d file with NOPASSWD.

Author: ColinFinck

master/master.cfg

@@ -247,7 +247,7 @@ def make_bs_regtestcd(*args):
     )
 
 def make_bs_regtest(*prepended_args):
-    cmd = list(prepended_args) + ["bash", scripts_root + "regtest", util.WithProperties('%(suffix)s')]
+    cmd = list(prepended_args) + [scripts_root + "regtest", util.WithProperties('%(suffix)s')]
 
     return steps.Compile(
         name="test",