fix: css prop is now overwhelmed with emotion (#9742)

superset-frontend/src/dashboard/components/HeaderActionsDropdown.jsx

@@ -37,7 +37,7 @@ const propTypes = {
   dashboardId: PropTypes.number.isRequired,
   dashboardTitle: PropTypes.string.isRequired,
   hasUnsavedChanges: PropTypes.bool.isRequired,
-  css: PropTypes.string.isRequired,
+  customCss: PropTypes.string.isRequired,
   colorNamespace: PropTypes.string,
   colorScheme: PropTypes.string,
   onChange: PropTypes.func.isRequired,
@@ -69,7 +69,7 @@ class HeaderActionsDropdown extends React.PureComponent {
   constructor(props) {
     super(props);
     this.state = {
-      css: props.css,
+      css: props.customCss,
       cssTemplates: [],
     };
 
@@ -116,7 +116,7 @@ class HeaderActionsDropdown extends React.PureComponent {
       forceRefreshAllCharts,
       refreshFrequency,
       editMode,
-      css,
+      customCss,
       colorNamespace,
       colorScheme,
       hasUnsavedChanges,
@@ -150,7 +150,7 @@ class HeaderActionsDropdown extends React.PureComponent {
             layout={layout}
             expandedSlices={expandedSlices}
             refreshFrequency={refreshFrequency}
-            css={css}
+            customCss={customCss}
             colorNamespace={colorNamespace}
             colorScheme={colorScheme}
             onSave={onSave}