akamai-purger: Check the correct pointer for manual mode configuratio…

…n file (#7177)

When running in manual mode, the `configFile` variable will take the
zero value of `""` while `manualConfigFile` will be provided on the CLI
by the operator. A startup check incorrectly dereferences `configFile`;
but correctly determines that it is the zero value `""`, outputs the
help text, and exits never allowing manual mode to perform work.

Fixes #7176

cmd/akamai-purger/main.go

@@ -257,7 +257,7 @@ func main() {
 	if os.Args[1] == "manual" {
 		manualMode = true
 		_ = manualFlags.Parse(os.Args[2:])
-		if *configFile == "" {
+		if *manualConfigFile == "" {
 			manualFlags.Usage()
 			os.Exit(1)
 		}