Increase item draw buffer size to 25 #283

Job	Run time
provide-examples	2s
run-ci (examples/Basic/Basic.ino)	1m 33s
run-ci (examples/Callbacks/Callbacks.ino)	1m 34s
run-ci (examples/CharsetInput/CharsetInput.ino)	1m 45s
run-ci (examples/IntFloatValues/IntFloatValues.ino)	1m 53s
run-ci (examples/ItemBack/ItemBack.ino)	1m 34s
run-ci (examples/List/List.ino)	1m 43s
run-ci (examples/MenuTimeout/MenuTimeout.ino)	1m 26s
run-ci (examples/SubMenu/SubMenu.ino)	1m 47s
run-ci (examples/ViewShifting/ViewShifting.ino)	2m 5s
run-ci (examples/Widgets/Widgets.ino)	2m 47s
	18m 9s

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