Show small square if vehicle owner does not match list owner.

No longer check the infrastructure sharing setting.
Add a separate setting to control company colour squares (default on).

src/table/settings.ini

@@ -3879,6 +3879,15 @@ strhelp  = STR_CONFIG_SETTING_SHOW_VEHICLE_GROUP_IN_DETAILS_HELPTEXT
 proc     = RedrawScreen
 cat      = SC_BASIC
 
+[SDTC_BOOL]
+var      = gui.show_vehicle_list_company_colour
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+def      = true
+str      = STR_CONFIG_SETTING_SHOW_VEHICLE_LIST_COMPANY_COLOUR
+strhelp  = STR_CONFIG_SETTING_SHOW_VEHICLE_LIST_COMPANY_COLOUR_HELPTEXT
+proc     = RedrawScreen
+cat      = SC_BASIC
+
 ; For the dedicated build we'll enable dates in logs by default.
 [SDTC_BOOL]
 ifdef    = DEDICATED