cmd, lib: Fix ineffectual assignments (ineffasign) and comment spelling

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3405

lib/model/model_test.go

@@ -563,7 +563,7 @@ func TestIgnores(t *testing.T) {
 
 	// Invalid path, marker should be missing, hence returns an error.
 	m.AddFolder(config.FolderConfiguration{ID: "fresh", RawPath: "XXX"})
-	ignores, _, err = m.GetIgnores("fresh")
+	_, _, err = m.GetIgnores("fresh")
 	if err == nil {
 		t.Error("No error")
 	}