Description
When the SassTask implements an instance of SassCompiler to execute instead of ScssPhpCompiler the style property passed is ignored.

Steps To Reproduce
Run a buildfile with a SassTask that contains a style property where SassTask::getExecutable() returns a non-null value. (e. g. when sass is installed globally using npm).

Expected behavior
The style parameter should be passed to whichever tool is being used to compile Sass.