Warped image involving relative moveto

[jzbrooks]

Describe the bug Merging a path that begins with a relative moveto (even though the first moveto in a path is always relative to the origin just like absolute coords) results in image warping.

vgo version 2.4.0

To Reproduce

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="36dp"
    android:height="62dp"
    android:viewportWidth="36"
    android:viewportHeight="62">
  <path
      android:pathData="m30.57,-0.0001h-25.57c-2.7614,0 -5,2.2387 -5,5.0001v51.08c0,2.7614 2.2386,5 5,5h25.6c2.7614,0 5,-2.2386 5,-5v-51.08c0,-1.3313 -0.5309,-2.6076 -1.4751,-3.5462 -0.9442,-0.9385 -2.2237,-1.4618 -3.5549,-1.4539zM32.57,56.08c0,1.1046 -0.8954,2 -2,2h-25.57c-1.1046,0 -2,-0.8954 -2,-2v-51.08c0,-1.1046 0.8954,-2 2,-2h25.6c1.1046,0 2,0.8954 2,2z"
      android:fillColor="#880099"
      android:fillType="nonZero"/>
  <path
      android:pathData="m28.67,9h-21.8c-0.8284,0 -1.5,0.6716 -1.5,1.5 0,0.8284 0.6716,1.5 1.5,1.5h21.8c0.8284,0 1.5,-0.6716 1.5,-1.5 0,-0.8284 -0.6716,-1.5 -1.5,-1.5z"
      android:fillColor="#880099"
      android:fillType="nonZero"/>
</vector>

Visual Comparison before/after

[jzbrooks]

This might be related to #88, but since these two paths don't intersect one another, I doubt it.