MM-31064: Simplify indentation (#16565)

* MM-31064: Simplify indentation

Reduce indentation where possible.

```release-note
NONE
```

Command ran to verify:
golangci-lint run --disable-all --enable golint --max-issues-per-linter=10000 --max-same-issues=100000 ./... | grep "block ends with a return state"

https://mattermost.atlassian.net/browse/MM-31064

* incorporate review comments

* enable golint for outdent rule

* fix remaining issues

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

utils/markdown/inlines.go

@@ -406,10 +406,9 @@ func (p *inlineParser) lookForLinkOrImage() {
 			}
 			p.delimiterStack.Remove(element)
 			return
-		} else {
-			p.delimiterStack.Remove(element)
-			break
 		}
+		p.delimiterStack.Remove(element)
+		break
 	}
 	absPos := relativeToAbsolutePosition(p.ranges, p.position)
 	p.inlines = append(p.inlines, &Text{