BUG: Do not reference script id

In the Colab notebook the id is never set for script for some reason. This leads
to a bug in the script that prevents the screenshot from being hidden and
incorrectly resizes the output area, forcing the user to scroll to find the
viewer.

Author: bnmajor

itkwidgets/viewer.py

@@ -119,15 +119,9 @@ async def create_screenshot(self):
     def update_screenshot(self, base64_image):
         html = HTML(
             f'''
-                <img id=screenshot_{self.wid} src={base64_image}>
-                <script id="script_{self.wid}" type="text/javascript">
-                    var container = document.getElementById("script_{self.wid}").parentNode;
+                <img id="screenshot_{self.wid}" src={base64_image}>
+                <script type="text/javascript">
                     var image = document.getElementById("screenshot_{self.wid}");
-                    if (!image) {{
-                        image = document.createElement("img");
-                        image.id = "screenshot_{self.wid}";
-                        container.appendChild(image);
-                    }}
                     image.src = "{base64_image}";
                     var viewer = document.getElementById("{self.wid}");
                     // Hide the static image if the Viewer is visible