fix #425: allow to set a color using hex code

src/components/settings/form/FormColorPicker.vue

@@ -17,6 +17,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 <template>
   <NcColorPicker
     v-model="model"
+    :advancedFields="true"
     class="cm-settings-form-colorpicker"
   >
     <div