Fix incorrect project links and use symlink icon for org-wide projects (#23325)

Fix displaying same projects icons between user/repo projects.
And fix incorrect projects links.
A part of https://github.com/go-gitea/gitea/pull/22865.


![image](https://user-images.githubusercontent.com/18380374/223044279-7b620ff1-d88a-4146-97e6-531bbf269761.png)

![image](https://user-images.githubusercontent.com/18380374/223044390-42911e3f-1f6b-439f-8441-4f3ebf99ea13.png)

![image](https://user-images.githubusercontent.com/18380374/223044437-5cad5391-0f95-4c8b-b0a3-32e263e2854f.png)

templates/org/menu.tmpl

@@ -4,7 +4,7 @@
 			{{svg "octicon-repo"}} {{.locale.Tr "user.repositories"}}
 		</a>
 		<a class="{{if .PageIsViewProjects}}active {{end}}item" href="{{$.Org.HomeLink}}/-/projects">
-			{{svg "octicon-project"}} {{.locale.Tr "user.projects"}}
+			{{svg "octicon-project-symlink"}} {{.locale.Tr "user.projects"}}
 		</a>
 		{{if .IsPackageEnabled}}
 		<a class="item" href="{{$.Org.HomeLink}}/-/packages">