Update new workspace button style (#17165)

Author: gtsiolis

components/dashboard/src/workspaces/CreateWorkspacePage.tsx

@@ -253,6 +253,7 @@ export function CreateWorkspacePage() {
                     <Button
                         onClick={onClickCreate}
                         autoFocus={true}
+                        size="block"
                         loading={isStarting || isLoading}
                         disabled={
                             !contextURL ||