Codechange: use C-style strings instread of std::string in the SettingDesc constructor

This as using std::string causes much more variables to be tracked, potentially causing problemes for certain compilers in certain situations

src/table/settings/settings.ini

@@ -1002,14 +1002,14 @@ post_cb  = MaxVehiclesChanged
 cat      = SC_BASIC
 
 [SDTG_BOOL]
-name     = {}
+name     = """"
 flags    = SF_NO_NETWORK
 var      = _old_vds.servint_ispercent
 def      = false
 to       = SLV_120
 
 [SDTG_VAR]
-name     = {}
+name     = """"
 type     = SLE_UINT16
 flags    = SF_GUI_0_IS_SPECIAL
 var      = _old_vds.servint_trains
@@ -1019,7 +1019,7 @@ max      = 800
 to       = SLV_120
 
 [SDTG_VAR]
-name     = {}
+name     = """"
 type     = SLE_UINT16
 flags    = SF_GUI_0_IS_SPECIAL
 var      = _old_vds.servint_roadveh
@@ -1029,7 +1029,7 @@ max      = 800
 to       = SLV_120
 
 [SDTG_VAR]
-name     = {}
+name     = """"
 type     = SLE_UINT16
 flags    = SF_GUI_0_IS_SPECIAL
 var      = _old_vds.servint_ships
@@ -1039,7 +1039,7 @@ max      = 800
 to       = SLV_120
 
 [SDTG_VAR]
-name     = {}
+name     = """"
 type     = SLE_UINT16
 flags    = SF_GUI_0_IS_SPECIAL
 var      = _old_vds.servint_aircraft