patch 8.2.4982: colors in terminal window are not 100% correct

Problem:    Colors in terminal window are not 100% correct.
Solution:   Use g:terminal_ansi_colors as documented. (closes #10429,
            closes #7227 closes #10347)

src/option.c

@@ -3255,6 +3255,7 @@ set_bool_option(
 # endif
 # ifdef FEAT_TERMINAL
 	term_update_colors_all();
+	term_update_palette_all();
 	term_update_wincolor_all();
 # endif
     }