baseapp: fix err message and use valid default consensus params values (#7471)

* update err msg and add passing default in simapp

* fix default

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

baseapp/params.go

@@ -64,7 +64,7 @@ func ValidateEvidenceParams(i interface{}) error {
 	}
 
 	if v.MaxNum <= 0 {
-		return fmt.Errorf("evidence maximum number of evidence must be positive: %v", v.MaxAgeDuration)
+		return fmt.Errorf("evidence maximum number of evidence must be positive: %v", v.MaxNum)
 	}
 
 	return nil

simapp/test_helpers.go

@@ -38,6 +38,7 @@ var DefaultConsensusParams = &abci.ConsensusParams{
 	Evidence: &tmproto.EvidenceParams{
 		MaxAgeNumBlocks: 302400,
 		MaxAgeDuration:  504 * time.Hour, // 3 weeks is the max duration
+		MaxNum:          50,
 	},
 	Validator: &tmproto.ValidatorParams{
 		PubKeyTypes: []string{