Set labscript suite profile as default key in startup function

The function that adds userlib and pythonlib to sys.path can't
interpolate labscript_suite unless the configparser is given it as a
default.

Author: chrisjbillington

labscript_profile/__init__.py

@@ -48,7 +48,7 @@ def add_userlib_and_pythonlib():
     labconfig = default_labconfig_path()
     if labconfig  is None or not os.path.exists(labconfig):
         return
-    config = ConfigParser()
+    config = ConfigParser(defaults={'labscript_suite': LABSCRIPT_SUITE_PROFILE})
     config.read(labconfig)
     for option in ['userlib', 'pythonlib']:
         try: