Rename File::get_len() get_length()

modules/gdnative/pluginscript/pluginscript_script.cpp

@@ -441,7 +441,7 @@ Error PluginScript::load_source_code(const String &p_path) {
 	FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);
 	ERR_FAIL_COND_V_MSG(err, err, "Cannot open file '" + p_path + "'.");
 
-	uint64_t len = f->get_len();
+	uint64_t len = f->get_length();
 	sourcef.resize(len + 1);
 	uint8_t *w = sourcef.ptrw();
 	uint64_t r = f->get_buffer(w, len);