Fix camera popup crash when only surveillance:operator is set

[resistanceisliberty]

In DFMapPopup.vue, abbreviatedOperator finds the matching operator tag key (operator or surveillance:operator) but then reads tags.operator directly. For a node tagged only with surveillance:operator, that value is undefined and the following operator.includes(...) throws, leaving a broken/empty popup. This reads the matched key (tags[operatorTagKey]) instead.