chore(submodules): use HTTPS URLs

Backport chen08209#1567 (Goooler), extended to tray_manager symmetrically.
Without this fresh clone fails for users without an SSH key in GitHub.

Author: oviron

.gitmodules

@@ -1,14 +1,14 @@
 [submodule "core/Clash.Meta"]
 	path = core/Clash.Meta
-	url = git@github.com:chen08209/Clash.Meta.git
+	url = https://github.com/chen08209/Clash.Meta
 	branch = FlClash
 [submodule "plugins/flutter_distributor"]
 	path = plugins/flutter_distributor
-	url = git@github.com:chen08209/flutter_distributor.git
+	url = https://github.com/chen08209/flutter_distributor
 	branch = FlClash
 [submodule "plugins/tray_manager"]
 	path = plugins/tray_manager
-	url = git@github.com:chen08209/tray_manager.git
+	url = https://github.com/chen08209/tray_manager
 	branch = main