upgrade proposal needs tx flags. (#6981)

* upgrade proposal needs tx flags

* use AddTxFlagToCmd to every proposal command

Co-authored-by: Alessio Treglia <alessio@tendermint.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

x/gov/client/cli/tx.go

@@ -61,6 +61,7 @@ func NewTxCmd(propCmds []*cobra.Command) *cobra.Command {
 
 	cmdSubmitProp := NewCmdSubmitProposal()
 	for _, propCmd := range propCmds {
+		flags.AddTxFlagsToCmd(propCmd)
 		cmdSubmitProp.AddCommand(propCmd)
 	}