Simplify schema to have a single drep hash

specifications/api/swagger.yaml

@@ -399,21 +399,11 @@ x-stakePoolId: &stakePoolId
   example: pool1wqaz0q0zhtxlgn0ewssevn2mrtm30fgh2g7hr7z9rj5856457mm
   description: A unique identifier for the pool.
 
-x-drepKeyHash: &drepKeyHash
+x-drepHash: &drepHash
   type: string
   format: bech32
   example: drep1wqaz0q0zhtxlgn0ewssevn2mrtm30fgh2g7hr7z9rj5856457mm
-  description: DRep's key hash according to CIP-0129.
-  pattern: "^(drep)1[0-9a-z]*$"
-
-x-drepScriptHash: &drepScriptHash
-  type: string
-  format: bech32
-  example: drep1wqaz0q0zhtxlgn0ewssevn2mrtm30fgh2g7hr7z9rj5856457mm
-  description: |
-    DRep's script hash according to CIP-0129. Note this is identical
-    to drepKeyHash but for unknown reasons we need to different
-    schema fragments here.
+  description: DRep's key or script hash according to CIP-0129.
   pattern: "^(drep)1[0-9a-z]*$"
 
 x-walletAccountXPubkey: &walletAccountXPubkey
@@ -2980,10 +2970,8 @@ components:
             - abstain
             - no_confidence
           title: casting a default vote
-        - <<: *drepKeyHash
+        - <<: *drepHash
           title: vote to a drep represented by key hash
-        - <<: *drepScriptHash
-          title: vote to a drep represented by script hash
 
     ApiWalletDelegationNext: &ApiWalletDelegationNext
       type: object