Fix bug in text rendering.
The bounding box for FreeType strings did not include the first character's horizontal bearing, leading to vtkImageData that was not wide enough, and ultimately wrapping artifacts on terminal glyphs. The included test reproduces the wrapping artifacts when the bbox minima are initialized to VTK_INT_MAX, and renders correctly when they are initialized to 0 (the initial pen position). Change-Id: Ibd99290220811546c9d6d87f4883e3ca89461186
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