fixed abstract contract formula namespace

src/formulas/formulas/contract/index.ts

@@ -1,3 +1,4 @@
+export * as abstract from './abstract'
 export * from './daoCore'
 export * from './delegation'
 export * from './distribution'
@@ -9,6 +10,5 @@ export * from './proposal'
 export * from './staking'
 export * as valence from './valence'
 export * from './voting'
-export * from './abstract'
 
 export * from './common'