Don't serialize LuaSourceContainer.ScriptGuid for scripts originati…

…ng from `$path` or `.luau` files

src/syncback/snapshot.rs

@@ -208,7 +208,11 @@ impl<'sync> SyncbackSnapshot<'sync> {
 
 pub fn filter_out_property(inst: &Instance, prop_name: &str) -> bool {
     match inst.class.as_str() {
-        "Script" | "LocalScript" | "ModuleScript" => prop_name == "Source",
+        "Script" | "LocalScript" | "ModuleScript" => {
+            // These properties shouldn't be set by scripts that are created via
+            // `$path` or via being on the file system.
+            prop_name == "Source" || prop_name == "ScriptGuid"
+        }
         "LocalizationTable" => prop_name == "Contents",
         "StringValue" => prop_name == "Value",
         _ => false,