Fix default value of Historizing variable attribute

in uaprotocol_hand.py

According to the specification, "[t]he Historizing attribute indicates
whether the Server is actively collecting data for the history of the
Variable. [...] Default value is FALSE."

asyncua/ua/uaprotocol_hand.py

@@ -271,7 +271,7 @@ def __post_init__(self):
 @dataclass
 class VariableAttributes(auto.VariableAttributes):
     ArrayDimensions: List[uatypes.UInt32] = None
-    Historizing: uatypes.Boolean = True
+    Historizing: uatypes.Boolean = False
     AccessLevel: uatypes.Byte = auto.AccessLevel.CurrentRead.mask
     UserAccessLevel: uatypes.Byte = auto.AccessLevel.CurrentRead.mask
     SpecifiedAttributes: uatypes.UInt32 = (