src/base/ftsynth.c: keep compatiblity in FT_GlyphSlot_Embolden
The delta is highly a matter of taste, but the style should be consistent. In some old applications x_scale and y_scale do not always match x_ppem and y_ppem, so fixed delta values will break bold fonts in those existing applications.
Amends dd78d4a7 ( !268 (merged))
Tested in WPS Office
| Before | After | Tag VER-2-13-0 |
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