Update the __1 in TestForwardDeclFromStdModule.py

[rupprecht]

Summary

Depends on D129898

[rupprecht]

Meant to update D129898 instead

lldb/test/API/commands/expression/import-std-module/forward_decl_from_module/TestForwardDeclFromStdModule.py

def test(self):
         self.runCmd("settings set target.import-std-module true")
 
         # Print the dummy `std::vector`. It only has the dummy member in it
         # so the standard `std::vector` formatter can't format it. Instead use
         # the raw output so LLDB has to show the member variable.
         # Both `std::vector` and the type of the member have forward
         # declarations before their definitions.
         self.expect("expr --raw -- v",
-                    substrs=['(std::__1::vector<int>) $0 = {', 'f = nullptr', '}'])
+                    patterns=[r'\(std::__[^:]*::vector<int>\) \$0 = {', 'f = nullptr', '}'])