Fix broken lint on main. (#40147)

`make lint-go` was not flagging issues in CI.

Makefile

@@ -218,7 +218,7 @@ lint-js:
 .help-short--lint-go:
 	@echo "Run the Go linters"
 lint-go:
-	-golangci-lint run --timeout 15m
+	golangci-lint run --timeout 15m
 ifndef SKIP_INCREMENTAL
 	$(MAKE) lint-go-incremental
 endif

cmd/fleetctl/fleetctl/get_test.go

@@ -569,7 +569,7 @@ func TestGetHosts(t *testing.T) {
 				part = "{" + part
 			}
 			if i < len(parts)-1 {
-				part = part + "}"
+				part += "}"
 			}
 			var obj map[string]any
 			require.NoError(t, json.Unmarshal([]byte(part), &obj))

server/fleet/activities.go

@@ -1506,9 +1506,11 @@ func (a ActivityEditedSmallstep) ActivityName() string {
 type ActivityTypeEnabledAndroidMDM struct{}
 
 func (a ActivityTypeEnabledAndroidMDM) ActivityName() string { return "enabled_android_mdm" }
+
 type ActivityTypeDisabledAndroidMDM struct{}
 
 func (a ActivityTypeDisabledAndroidMDM) ActivityName() string { return "disabled_android_mdm" }
+
 type ActivityTypeCanceledRunScript struct {
 	HostID          uint   `json:"host_id"`
 	HostDisplayName string `json:"host_display_name"`