Add default argument processing for `NodePath`

(cherry picked from commit 37e7a6da0536d496e2e3773911fdf300a2c5522d)

binding_generator.py

@@ -2431,6 +2431,7 @@ def correct_default_value(value, type_name):
         "null": "nullptr",
         '""': "String()",
         '&""': "StringName()",
+        '^""': "NodePath()",
         "[]": "Array()",
         "{}": "Dictionary()",
         "Transform2D(1, 0, 0, 1, 0, 0)": "Transform2D()",  # Default transform.
@@ -2444,6 +2445,8 @@ def correct_default_value(value, type_name):
         return f"{{}}"
     if value.startswith("&"):
         return value[1::]
+    if value.startswith("^"):
+        return value[1::]
     return value