Increased specificity of inspector config CSS.

The CSS wasn't specific enough, leading to incorrect styles being
applied to boolean settings. Fixes bug
https://bugs.launchpad.net/juju-gui/+bug/1370260.
Merge pull request #568 from kadams54/fix-inspector-toggles-1370260

Increase specificity of inspector config CSS.

The CSS wasn't specific enough, leading to incorrect styles being
applied to boolean settings. Fixes bug
https://bugs.launchpad.net/juju-gui/+bug/1370260.