drop flasher extension

Windows is smart enough to add trailing .exe, so we'll be able to add different commandlines depending on host OS

Author: facchinm

programmer.go

@@ -297,7 +297,7 @@ func spHandlerProgram(flasher string, cmdString []string) error {
 		extension = ".exe"
 	}
 
-	oscmd = exec.Command(flasher+extension, cmdString...)
+	oscmd = exec.Command(flasher, cmdString...)
 
 	tellCommandNotToSpawnShell(oscmd)