Fix indentation of sighup handler calling code (#19060)

Author: anoadragon453

changelog.d/19060.bugfix

@@ -0,0 +1 @@
+Fix a bug introduced in 1.136.0 that would prevent Synapse from being able to be `reload`-ed more than once when running under systemd.

synapse/app/_base.py

@@ -591,9 +591,9 @@ async def _handle_sighup(*args: Any, **kwargs: Any) -> None:
                 # we're not using systemd.
                 sdnotify(b"RELOADING=1")
 
-            for sighup_callbacks in _instance_id_to_sighup_callbacks_map.values():
-                for func, args, kwargs in sighup_callbacks:
-                    func(*args, **kwargs)
+                for sighup_callbacks in _instance_id_to_sighup_callbacks_map.values():
+                    for func, args, kwargs in sighup_callbacks:
+                        func(*args, **kwargs)
 
                 sdnotify(b"READY=1")