test_taskbar: use the sample app for future tests instead of notepad, cleanups
test_taskbar: use the sample app for future tests instead of notepad, cleanups

pywinauto/pywinauto,airelil/pywinauto,vasily-v-ryabov/pywinauto,drinkertea/pywinauto,MagazinnikIvan/pywinauto,moden-py/pywinauto,moden-py/pywinauto,cetygamer/pywinauto