Variable dialog width for MRProgressOverlayViewModeIndeterminateSmall and MRProgressOverlayViewModeIndeterminateSmallDefault to keep titleLableText as one line as possible

MRProgressOverlayViewModeIndeterminateSmall and MRProgressOverlayViewModeIndeterminateSmallDefault mode are used with one word commonly, the fixed width 150 point is not long enough for some common word just as “Searching...” or “Preparing...” for example.