refactor: drop extra internal calls to VerifyAppName

These are duplicative of the checks that happen at the subcommand level.

plugins/proxy/proxy.go

@@ -35,11 +35,6 @@ func inRange(value int, min int, max int) bool {
 
 // IsAppProxyEnabled returns true if proxy is enabled; otherwise return false
 func IsAppProxyEnabled(appName string) bool {
-	err := common.VerifyAppName(appName)
-	if err != nil {
-		common.LogFail(err.Error())
-	}
-
 	proxyEnabled := true
 	disableProxy := config.GetWithDefault(appName, "DOKKU_DISABLE_PROXY", "")
 	if disableProxy != "" {