Some code improvements

* Some assignments simplified by using assignment operators
* Rewrite switch statement with only one case as if.
* Rewrite if-else chain as a switch statement.
* go fmt `modules/todoist/project.go` file.

modules/status/widget.go

@@ -37,7 +37,7 @@ func (widget *Widget) animation() string {
 	icons := []string{"|", "/", "-", "\\", "|"}
 	next := icons[widget.CurrentIcon]
 
-	widget.CurrentIcon = widget.CurrentIcon + 1
+	widget.CurrentIcon++
 	if widget.CurrentIcon == len(icons) {
 		widget.CurrentIcon = 0
 	}