Fix shadowed variables in various places: Part 2 of 2 (#10176)

This PR fixes shadowed variables in the following packages:
- `app`
- `utils`
- `utils/markdown`
- `services/mailservice`

utils/markdown/inlines.go

@@ -398,8 +398,8 @@ func (p *inlineParser) lookForLinkOrImage() {
 				p.inlines = append(p.inlines[:d.TextNode], inline)
 			} else {
 				p.inlines = append(p.inlines[:d.TextNode], inline)
-				for element := element.Prev(); element != nil; element = element.Prev() {
-					if d := element.Value.(*delimiter); d.Type == linkOpeningDelimiter {
+				for inlineElement := element.Prev(); inlineElement != nil; inlineElement = inlineElement.Prev() {
+					if d := inlineElement.Value.(*delimiter); d.Type == linkOpeningDelimiter {
 						d.IsInactive = true
 					}
 				}