Update Neutron approval function to use string in proposal_id

Author: saajand

src/pages/Cosmos/CosmosApproveProposalslPage.tsx

@@ -76,7 +76,7 @@ const CosmosApproveProposalslPage = () => {
     const voteValue = 'yes';
     const txMsg = {
       vote: {
-        proposal_id: proposalId,
+        proposal_id: String(proposalId),
         vote: voteValue,
       },
     };

src/pages/Cosmos/CosmosProposalDetails.tsx

@@ -185,7 +185,7 @@ const CosmosProposalDetails = () => {
     const voteValue = 'yes';
     const txMsg = {
       vote: {
-        proposal_id: proposalId,
+        proposal_id: String(proposalId),
         vote: voteValue,
       },
     };