Remove some unnecessary graphics state saves on Haiku

Remove some unnecessary graphics state saves on Haiku

* src/haikufont.c (haikufont_draw):
* src/haikuterm.c (haiku_draw_box_rect):
(haiku_draw_relief_rect):
(haiku_draw_underwave):
(haiku_draw_text_decoration):
(haiku_draw_plain_background):
(haiku_draw_glyph_string_foreground):
(haiku_draw_glyphless_glyph_string_foreground):
(haiku_draw_stretch_glyph_string):
(haiku_draw_composite_glyph_string_foreground):
(haiku_draw_image_glyph_string): Remove unnecessary calls to
BView_StartClip and BView_EndClip.