Chore: Fix issues reported by staticcheck; enable stylecheck linter (#28866)

* Chore: Fix issues reported by staticcheck

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Apply suggestions from code review

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

pkg/setting/setting.go

@@ -325,26 +325,26 @@ type Cfg struct {
 }
 
 // IsExpressionsEnabled returns whether the expressions feature is enabled.
-func (c Cfg) IsExpressionsEnabled() bool {
-	return c.FeatureToggles["expressions"]
+func (cfg Cfg) IsExpressionsEnabled() bool {
+	return cfg.FeatureToggles["expressions"]
 }
 
 // IsLiveEnabled returns if grafana live should be enabled
-func (c Cfg) IsLiveEnabled() bool {
-	return c.FeatureToggles["live"]
+func (cfg Cfg) IsLiveEnabled() bool {
+	return cfg.FeatureToggles["live"]
 }
 
 // IsNgAlertEnabled returns whether the standalone alerts feature is enabled.
-func (c Cfg) IsNgAlertEnabled() bool {
-	return c.FeatureToggles["ngalert"]
+func (cfg Cfg) IsNgAlertEnabled() bool {
+	return cfg.FeatureToggles["ngalert"]
 }
 
-func (c Cfg) IsDatabaseMetricsEnabled() bool {
-	return c.FeatureToggles["database_metrics"]
+func (cfg Cfg) IsDatabaseMetricsEnabled() bool {
+	return cfg.FeatureToggles["database_metrics"]
 }
 
-func (c Cfg) IsHTTPRequestHistogramEnabled() bool {
-	return c.FeatureToggles["http_request_histogram"]
+func (cfg Cfg) IsHTTPRequestHistogramEnabled() bool {
+	return cfg.FeatureToggles["http_request_histogram"]
 }
 
 type CommandLineArgs struct {