lib.ExecContext.CallContext.log_delim: Beautify

Make the log delimiter look more consistent: Whether a CallContext was constructed with a title parameter or without, prefix its .log_delimiter property with a "----".
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/ExecContext.py

@@ -115,16 +115,15 @@ class ExecContext(Base):
             throw: bool,
             verbose: bool | None,
         ) -> None:
+            if title is None:
+                title = f'{parent.uri}: Running {self.pretty_cmd} -'
             self.__cmd = cmd
             self.__wd = wd
             self.__log_prefix = log_prefix
             self.__parent = parent
             self.__title = title
             self.__pretty_cmd: str | None = None
-            self.__delim = (
-                title if title is not None else
-                f'---- {parent.uri}: Running {self.pretty_cmd} -'
-            )
+            self.__delim = f'---- {title} -'
             delim_len = 120
             self.__delim += '-' * max(0, delim_len - len(self.__delim))
             self.__mod_env = {'LC_ALL': 'C'} if mod_env is None else mod_env