add core styles to Robodog

packages/@uppy/robodog/src/style.scss

@@ -1,5 +1,6 @@
 @import '@uppy/core/src/_utils.scss';
 @import '@uppy/core/src/_variables.scss';
+@import '@uppy/core/src/style.scss';
 @import '@uppy/status-bar/src/style.scss';
 @import '@uppy/url/src/style.scss';
 @import '@uppy/webcam/src/style.scss';