Remove tui_display_data_from_line

Remove tui_display_data_from_line

tui_display_data_from_line is just a wrapper for
tui_display_registers_from_line, so remove it.  Also, nothing passed 0
as the "force_display" parameter to tui_display_registers_from_line,
so remove that parameter as well.

gdb/ChangeLog
2019-07-17  Tom Tromey  <tom@tromey.com>

	* tui/tui-windata.h (tui_display_data_from_line): Don't declare.
	* tui/tui-windata.c (tui_display_data_from_line): Remove.
	(tui_display_data_from, tui_data_window::do_scroll_vertical): Call
	tui_display_registers_from_line.
	* tui/tui-regs.h (tui_display_registers_from_line): Update.
	* tui/tui-regs.c (tui_display_registers_from_line): Remove
	"force_display" parameter.