fix trailing whitespace in Javascript

I want to make travis-ci enforce that everything passes lint.
Get it in a good state first.

ui-src/lib/models/Range.js

@@ -65,7 +65,7 @@ export default class Range {
    * Determine if value is inside the range.
    *
    * @param  {Number}  value Value to test
-   * @return {Boolean} 
+   * @return {Boolean}
    */
   isInRange(value) {
     return value >= this.low && value <= this.high;

ui-src/lib/support/RecordingFormatter.js

@@ -75,7 +75,7 @@ export default class RecordingFormatter {
   /**
    * Produce an object whose properties are individual pieces of a recording's
    * data, formatted for display purposes.
-   * 
+   *
    * @param  {Recording} recording    Recording to be formatted
    * @param  {Range90k} trimRange     Optional time range for trimming the
    *                                  recording's interval