terminal: remove DevConfig.Validate params

As the `DevConfig.Validate` params are no longer used in the Validate
method, we can remove them from the method signature.

config.go

@@ -551,7 +551,7 @@ func loadAndValidateConfig(interceptor signal.Interceptor) (*Config, error) {
 		)
 	}
 
-	err = cfg.DevConfig.Validate(litDir, cfg.Network)
+	err = cfg.DevConfig.Validate()
 	if err != nil {
 		return nil, err
 	}

config_dev.go

@@ -15,8 +15,7 @@ func defaultDevConfig() *DevConfig {
 	return &DevConfig{}
 }
 
-// Validate checks that all the values set in our DevConfig are valid and uses
-// the passed parameters to override any defaults if necessary.
-func (c *DevConfig) Validate(dbDir, network string) error {
+// Validate checks that all the values set in our DevConfig are valid.
+func (c *DevConfig) Validate() error {
 	return nil
 }

config_prod.go

@@ -13,6 +13,6 @@ func defaultDevConfig() *DevConfig {
 }
 
 // Validate is a no-op function during a production build.
-func (c *DevConfig) Validate(_, _ string) error {
+func (c *DevConfig) Validate() error {
 	return nil
 }