Simplify tui_update_source_windows_with_line

Simplify tui_update_source_windows_with_line

This changes tui_update_source_windows_with_line to take a
symtab_and_line, rather than separate parameters, and then updates the
caller.

gdb/ChangeLog
2019-12-20  Tom Tromey  <tom@tromey.com>

	* tui/tui.c (tui_show_source): Update.
	* tui/tui-winsource.h (tui_update_source_windows_with_line): Update.
	* tui/tui-winsource.c (tui_update_source_windows_with_line): Take
	a symtab_symbol_info, not a separate symtab and line.  Simplify.

Change-Id: I8803a0a6fd2938ceee859aea53a57ce582f3e80d