[CSM-26] Fix `toEvent` for decoding event type
[CSM-26] Fix `toEvent` for decoding event type

After decoding generic event types, all event names
are wrapped into `""` (e.g `CallMeString` -> `"CallMeString"`),
which does not mapped with generic event types on backend side

input-output-hk/cardano-sl-explorer,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl-explorer,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl-explorer