renderjs-extension: fixed syntax error related to multi-line string

renderjs_ipyextension/renderjs_ipyextension/renderjs_extension.py

@@ -99,8 +99,8 @@ def call_declared_method(ref, method_name, *args):
 # Only thing passed is the ref of the gadget
 def destroy(ref):
     from IPython.core.display import display, HTML
-    script = 
-    '''<script>
+    script = '''
+    <script>
     var destroy_event = new CustomEvent("destroy_gadget",
       { "detail": { "gadgetId": "''' + ref + '''" }});
     var loadingDiv = document.querySelector(".loading_gadget");