[Merge] ~jawn-smith/software-properties:outdated_cache_error_dialog into software-properties:ubuntu/master

[William Wilson]

William Wilson has proposed merging ~jawn-smith/software-properties:outdated_cache_error_dialog into software-properties:ubuntu/master.

Commit message:
Changing the variable passed to the Error dialo
g to the correct variable type"

Requested reviews:
  Brian Murray (brian-murray)

For more details, see:
https://code.launchpad.net/~jawn-smith/software-properties/+git/software-properties/+merge/396874

In the DialogCacheOutdated class, certain error scenarios were attempting to create a dialog message window. The first variable was passing the class rather than the class's parent window, as should happen.
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