Fix spelling mistake / typo: "Criticall error"

Noticed this when finding a crash in the installer today. This
is a translation break, I guess, but shouldn't be too bad as
it was only added eight days ago?

Signed-off-by: Adam Williamson <awilliam@redhat.com>

ui/webui/src/components/Error.jsx

@@ -180,7 +180,7 @@ export const CriticalError = ({ exception, isBootIso, reportLinkURL }) => {
           description={description}
           reportLinkURL={addExceptionDataToReportURL(reportLinkURL, exception)}
           idPrefix={idPrefix}
-          title={_("Criticall error")}
+          title={_("Critical error")}
           titleIconVariant="danger"
           logFile="/tmp/webui.log"
           detailsLabel={_("Error details")}