Add client setting to show train weight ratios in details header.

Off by default.

src/table/settings.ini

@@ -3133,6 +3133,15 @@ strhelp  = STR_CONFIG_SETTING_GRAPH_LINE_THICKNESS_HELPTEXT
 strval   = STR_JUST_COMMA
 proc     = RedrawScreen
 
+[SDTC_BOOL]
+var      = gui.show_train_weight_ratios_in_details
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+def      = false
+str      = STR_CONFIG_SETTING_SHOW_TRAIN_WEIGHT_RATIOS_IN_DETAILS
+strhelp  = STR_CONFIG_SETTING_SHOW_TRAIN_WEIGHT_RATIOS_IN_DETAILS_HELPTEXT
+proc     = RedrawScreen
+cat      = SC_EXPERT
+
 [SDTC_BOOL]
 var      = gui.show_restricted_signal_default
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC