modules/gcal: Use colors.eventTime for timestamp of event

Color of description should not change the color of event time. This
commit uses the independent setting color.eventTime instead. This
defaults to "white" and is consistent with the current behaviour when
a value for colors.description is not set.

Fixes #638

modules/gcal/display.go

@@ -48,7 +48,7 @@ func (widget *Widget) content() (string, string, bool) {
 	}
 
 	for _, calEvent := range calEvents {
-		timestamp := fmt.Sprintf("[%s]%s", widget.descriptionColor(calEvent), calEvent.Timestamp())
+		timestamp := fmt.Sprintf("[%s]%s", widget.eventTimeColor(calEvent), calEvent.Timestamp())
 		if calEvent.AllDay() {
 			timestamp = ""
 		}
@@ -116,6 +116,10 @@ func (widget *Widget) descriptionColor(calEvent *CalEvent) string {
 	return widget.settings.colors.description
 }
 
+func (widget *Widget) eventTimeColor(calEvent *CalEvent) string {
+	return widget.settings.colors.eventTime
+}
+
 func (widget *Widget) eventSummary(calEvent *CalEvent, conflict bool) string {
 	summary := calEvent.event.Summary