Fix: Sizing of Multiplayer server list incorrect when GUI zoom doesn't match Font zoom.

The server information panel was scaled by GUI scale, which could result in a panel that is longer than the server list. This height difference is then maintained when the window is resized to fill the screen.
Instead, specify the minimum size by number of text lines and (summed total) padding.

src/network/network_gui.cpp

@@ -954,7 +954,7 @@ static const NWidgetPart _nested_network_game_widgets[] = {
 					EndContainer(),
 					NWidget(WWT_PANEL, COLOUR_LIGHT_BLUE, WID_NG_DETAILS),
 						NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(5, 5, 5),
-							NWidget(WWT_EMPTY, INVALID_COLOUR, WID_NG_DETAILS_SPACER), SetMinimalSize(140, 155), SetResize(0, 1), SetFill(1, 1), // Make sure it's at least this wide
+							NWidget(WWT_EMPTY, INVALID_COLOUR, WID_NG_DETAILS_SPACER), SetMinimalSize(140, 0), SetMinimalTextLines(15, 24 + WD_PAR_VSEP_NORMAL), SetResize(0, 1), SetFill(1, 1), // Make sure it's at least this wide
 							NWidget(NWID_HORIZONTAL, NC_NONE), SetPIP(5, 5, 5),
 								NWidget(NWID_SELECTION, INVALID_COLOUR, WID_NG_NEWGRF_MISSING_SEL),
 									NWidget(WWT_PUSHTXTBTN, COLOUR_WHITE, WID_NG_NEWGRF_MISSING), SetFill(1, 0), SetDataTip(STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON, STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_TOOLTIP),