Removing install-missing-android-tools step

[koral]

@gpeal8

Presumably, this is because we have the same build tools version that is bundled and if we remove it, things will be fine. However, if we were to do this, would we need to stay in perfect lock-step with bitrise or are there multiple versions installed on the image?

Here is some info about that: Bitrise build fails in install-missing-android-tools@2.3.4 step - #7 by koral (in the middle of the post).