Fix minimum and maximum curtain state

[dnicolson]

♻️ Current situation

The curtain set_min and set_max options do not appear to work correctly.

💡 Proposed solution

It looks like the setMinMax call needs to occur after the previous line otherwise the CurrentPosition value would always be redefined. Fixes #123.

➕ Additional Information

The setMinMax in the constructor is removed as the CurrentPosition value is redefined later in the method. The !this.setNewTarget conditional was also removed because it would always evaluate to true.

[donavanbecker]

@dnicolson Thanks! I will merge this into beta so we can get a few people to test before we publish a new version