fix(google-maps): if statement equality type fix by @tomtomau
fix(google-maps): if statement equality type fix by @tomtomau

https://github.com/Vheissu/aurelia-google-maps/pull/23/commits/e8f3107d96d0fd903f7db90e2f75ca3afdb39775

mrchjp/aurelia-google-maps,mrchjp/aurelia-google-maps,Vheissu/aurelia-google-maps,Vheissu/aurelia-google-maps,mrchjp/aurelia-google-maps