Removed explicit exec tray height setting. Fixes #950 (#951)

src/visualizers/widgets/PipelineEditor/PipelineEditorWidget.js

@@ -295,7 +295,6 @@ define([
             this.$execContent.empty();
             execs.forEach(html => this.$execContent.append(html));
 
-            this.$execContent.height(200);
             this.$execBody.show();
         } else {
             // Set the height to 0