Allow for -.js in modules names.

[ThomasK0lasa]

As per contribution guidelines I assume this fork is a one/two line fix.

User story:
In our project we use Chart.js which we defined in paths as "chartjs": "filepath". As You can see the module name is without the dot. But we also need chartjs-adapter-moment which assumes and requires module named 'chart.js'. Currently we forked the chartjs-adapter-moment and made needed change to allow working it with Require.js.

Problem:
Even if there's a 'chart.js' module defined in config.paths it won't work because Require.js assumes 'chart.js' is a file path because of the -.js.

Solution:
If there's module defined in config.paths with -.js inside then use the defined path instead first assuming that it's a js file path. Simply saying: just check first if exact name is defined in config.paths and if not then go with the old way.
If my solution is not good enough please adjust it as You like, but don't ignore the -.js module name problem.