fix(client,server): consistently set env prefix between client/server (#18345)

server/start.go

@@ -147,20 +147,13 @@ API services are enabled via the 'grpc-only' flag. In this mode, CometBFT is
 bypassed and can be used when legacy queries are needed after an on-chain upgrade
 is performed. Note, when enabled, gRPC will also be automatically enabled.
 `,
-		PreRunE: func(cmd *cobra.Command, _ []string) error {
+		RunE: func(cmd *cobra.Command, _ []string) error {
 			serverCtx := GetServerContextFromCmd(cmd)
-
-			// Bind flags to the Context's Viper so the app construction can set
-			// options accordingly.
-			if err := serverCtx.Viper.BindPFlags(cmd.Flags()); err != nil {
+			_, err := GetPruningOptionsFromFlags(serverCtx.Viper)
+			if err != nil {
 				return err
 			}
 
-			_, err := GetPruningOptionsFromFlags(serverCtx.Viper)
-			return err
-		},
-		RunE: func(cmd *cobra.Command, _ []string) error {
-			serverCtx := GetServerContextFromCmd(cmd)
 			clientCtx, err := client.GetClientQueryContext(cmd)
 			if err != nil {
 				return err