Apply suggestions from code review

Co-authored-by: Mario Buikhuizen <[email protected]>

Author: kecnry

glue_jupyter/widgets/axes_limits.vue

@@ -2,8 +2,8 @@
   <v-row>
     <v-col cols=6>
       <glue-float-field label="xmin" :value.sync="glue_state.x_min" />
-    </v-col cols=6>
-    <v-col>
+    </v-col>
+    <v-col  cols="6">
       <glue-float-field label="xmax" :value.sync="glue_state.x_max" />
     </v-col>
   </v-row>