It assumes that the process has only a single document opened
(createView() creates a new window on the frame returned by
SfxViewFrame::First()), while it's possible that in this test an other
testcase forgot to dispose its component.

This way testCursorWindows() depends less on other testcases, and
ideally all testcases should be entirely independent of each other.

Change-Id: I35decb0b69aeebd3984f4da4386c696a63fe3e04
Reviewed-on: https://gerrit.libreoffice.org/29300Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>