Playground: Change hive to hive_ce that supports WASM builds

Author: rydmike

example/pubspec.yaml

@@ -62,9 +62,10 @@ dependencies:
 
  # Hive local storage, originally by Simon Leir.
  # Used as value-key pair persistence service in examples 4 and 5 (Themes Playground).
- # This is a community fork that supports WASM-GC.
  # hive: ^2.2.3 # Original Hive package
+ # This is a community fork that supports WASM-GC.
  hive_ce: ^2.7.0+1
+ # path: ../../hive_ce/hive # Use this to test a local copy of hive_ce
 
  # Internationalization package, by Google dart.dev.
  # Used only for date time string formatting in example 5.