Rename the "reset" method to "resize"
    
    tui_gen_win_info::reset really just resizes the window.  This patch
    renames it to reflect this.
    
    gdb/ChangeLog
    2019-08-15  Tom Tromey  <tom@tromey.com>
    
    	* tui/tui-winsource.h (struct tui_source_window_base) <resize>:
    	Rename from reset.
    	* tui/tui-winsource.c (tui_source_window_base::resize): Rename.
    	* tui/tui-layout.c (show_source_disasm_command, show_data):
    	Update.
    	(tui_gen_win_info::resize): Rename.
    	(show_source_or_disasm_and_command): Update.
    	* tui/tui-data.h (struct tui_gen_win_info) <resize>: Rename from
    	reset.