Fix initial storage value

Errant modification made by accident

Author: ConnectedSystems

test/data/campaspe/campaspe_network.yml

@@ -35,7 +35,7 @@
   area: 30.11
   parameters:
     storage_coef: 5.243068550275504
-  initial_storage: 0.0
+  initial_storage: 304398.6
   max_storage: 306000.0
   functions:
     calc_dam_level: |-