[MWF] Don't truncate text on ToolStripButton

Previous code subtracted 4 pixels of the height of the text of a
toolstrip button, presumably to leave a margin. However, margins
are handled elsewhere, so we ended up with truncated text.
Merge pull request #1448 from ermshiperete/TSBTextTruncation

[MWF] Don't truncate text on ToolStripButton