try to enable click anywhere in Geo mode

[yiyuezhuo]

The original PR will break when one clicks "anywhere" on the Map figure. This PR fix it:

Basic test case with dev tools:

       var TESTER = Tabs.getGraph()

        var data = [{
            type: 'scattergeo',
            lat: [ 40.7127, 51.5072 ],
            lon: [ -74.0059, 0.1275 ],
            mode: 'lines',
            line:{
                width: 2,
                color: 'blue'
            }
        }];

        var layout = {
            title: 'London to NYC Great Circle',
            showlegend: false,
            geo: {
                resolution: 50,
                showland: true,
                showlakes: true,
                landcolor: 'rgb(204, 204, 204)',
                countrycolor: 'rgb(204, 204, 204)',
                lakecolor: 'rgb(255, 255, 255)',
                projection: {
                    type: 'equirectangular'
                },
                coastlinewidth: 2,
                lataxis: {
                    range: [ 20, 60 ],
                    showgrid: true,
                    tickmode: 'linear',
                    dtick: 10
                },
                lonaxis:{
                    range: [-100, 20],
                    showgrid: true,
                    tickmode: 'linear',
                    dtick: 20
                }
            },
            clickmode: "event+anywhere"
        };

        Plotly.newPlot(TESTER, data, layout);

        TESTER.on('plotly_click', function(clickData) {
            console.log(clickData);
            var x = clickData["points"][0]["x"];
        });

[yiyuezhuo]

Run unit tests locally using npm run test-jasmine give many random errors so that I can't find a proper way to test locally...