chore: update submodules to https

Author: farfromrefug

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "demo-ng"]
 	path = demo-ng
-	url = git@github.com:nativescript-community/plugin-seed-demo-ng.git
+	url = https://github.com/nativescript-community/plugin-seed-demo-ng.git
 [submodule "tools"]
 	path = tools
-	url = git@github.com:nativescript-community/plugin-seed-tools.git
+	url = https://github.com/nativescript-community/plugin-seed-tools.git