lib.ExecContext.run(): Fix: Pass up Exceptions

Fix another regression of commit 6db73873e7: lib.ExecContext.CallContext.__exit__() returns True, which swallows all exceptions thrown in the context of _run() and _sudo(). Fix that.
Signed-off-by: Jan Lindemann <jan@janware.com>

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

@@ -174,9 +174,8 @@ class ExecContext(Base):
             exc_type: Type[BaseException] | None,
             exc_value: BaseException | None,
             traceback: TracebackType | None,
-        ) -> bool:
+        ) -> None:
             self.log_delim(start = False)
-            return True
 
         @property
         def log_prefix(self) -> str: