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)
diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index 996ac70..0736563 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -34,6 +34,7 @@
 void term_reset_wincolor(win_T *wp);
 void term_update_wincolor(win_T *wp);
 void term_update_wincolor_all(void);
+void term_update_palette_all(void);
 void term_update_colors_all(void);
 char_u *term_get_status_text(term_T *term);
 void term_clear_status_text(term_T *term);