Change location of perspective repo

Author: Katrix

.gitmodules

@@ -179,4 +179,4 @@
 	url = https://github.com/dotty-staging/izumi-reflect.git
 [submodule "community-build/community-projects/perspective"]
 	path = community-build/community-projects/perspective
-	url = https://github.com/Katrix/perspective.git
+	url = https://github.com/dotty-staging/perspective.git