issue fix for active_view().settings() in __init__

i had an issue on windows where `self.window.active_view().settings()` in the `__init__` method returned a `NoneType` which raised the following message in the console, "AttributeError: 'NoneType' object has no attribute 'settings'".

the result was that build switcher and package control stopped working altogether.

i moved the settings code block from `__init__` to `run` and it fixed my issue.