Resolve "creating label fails with default color"

Closes #180 (closed)

frontend/src/components/feedback_labels/FeedbackLabelForm.vue

@@ -40,7 +40,7 @@ import { FeedbackLabels } from "@/store/modules/feedback-labels";
 export default class FeedbackLabelForm extends Vue {
   @Prop({ type: String, default: "" }) readonly name!: string
   @Prop({ type: String, default: "" }) readonly description!: string
-  @Prop({ type: String, default: "#4d4d4d" }) readonly colour!: string
+  @Prop({ type: String, default: "#4D4D4D" }) readonly colour!: string
   @Prop({ type: Number, required: false }) readonly pk!: number
   @Prop({ type: Boolean, default: false }) readonly is_update!: boolean