Revert "only mark backend vars as dirty if they have changed (#4494)" (#4547)

This reverts commit 3d89d74.

Author: masenf

reflex/state.py

@@ -1307,9 +1307,6 @@ def __setattr__(self, name: str, value: Any):
             return
 
         if name in self.backend_vars:
-            # abort if unchanged
-            if self._backend_vars.get(name) == value:
-                return
             self._backend_vars.__setitem__(name, value)
             self.dirty_vars.add(name)
             self._mark_dirty()