match UX guide for submit/cancel buttons

app/assets/javascripts/vue_shared/components/popup_dialog.vue

@@ -111,14 +111,14 @@ export default {
           <div class="modal-footer" v-if="!hideFooter">
             <button
               type="button"
-              class="btn btn-default pull-right"
+              class="btn btn-default pull-left"
               @click="close"
             >
               Cancel
             </button>
             <button
               type="button"
-              class="btn pull-left"
+              class="btn pull-right"
               :disabled="submitDisabled"
               :class="btnKindClass"
               @click="emitSubmit(true)"