Revert "Add size option to default balloon close #249"

This reverts commit a19c0d3.

src/balloons/default.ts

@@ -31,12 +31,6 @@ export type BalloonOptions = {
    * If not provided, the default sound will be used.
    */
   popSoundUrl: string;
-  /**
-   * The size of the balloon.
-   *
-   * The first value is the minimum size and the second value is the maximum size.
-   */
-  size: [number, number];
   /**
    * The duration thresholds for the rise animation.
    *
@@ -73,7 +67,6 @@ export default class Default extends Balloon {
       dir_name: this.name,
       imageUrl: this.originalPath('/icon.png'),
       popSoundUrl: this.originalPath('/pop.mp3'),
-      size: [50, 75],
       riseDurationThreshold: [10000, 15000],
       swingDurationThreshold: [2, 4],
       swingOffset: 15,
@@ -128,8 +121,8 @@ export default class Default extends Balloon {
   }
 
   public build() {
+    const size = random(50, 75);
     const positionX = random(5, 95);
-    const size = random(this.options.size[0], this.options.size[1]);
     const riseDuration = random(
       this.options.riseDurationThreshold[0],
       this.options.riseDurationThreshold[1]