Bump version # of user config file from 18 to 19

v19 is now stamped into config files when CodeSnip v4.21.0 starts for
the first time.

Author: delphidabbler

Src/FirstRun.UConfigFile.pas

@@ -82,7 +82,7 @@   TUserConfigFileUpdater = class(TConfigFileUpdater)
   strict private
     const
       ///  <summary>Current user config file version.</summary>
-      FileVersion = 18;
+      FileVersion = 19;
   strict protected
     ///  <summary>Returns current user config file version.</summary>
     class function GetFileVersion: Integer; override;