Make cols configurable

aleksis/core/frontend/components/generic/dialogs/DialogObjectForm.vue

@@ -16,7 +16,7 @@
       <v-form v-model="valid">
         <v-container>
           <v-row>
-            <v-col cols="12" sm="6" v-for="field in fields" :key="field.value">
+            <v-col cols="12" :sm="field.cols || 6" v-for="field in fields" :key="field.value">
               <slot
                 :label="field.text"
                 :name="field.value + '.field'"