Remove unused constants.

Change-Id: I95073d8b0b73398bc48b7937d50a1bcced1e8cc1
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/coreplugin/coreconstants.h

@@ -38,11 +38,8 @@ namespace Constants {
 
 // Modes
 const char MODE_WELCOME[]          = "Welcome";
-const char MODE_WELCOME_TYPE[]     = "Type.Welcome";
 const char MODE_EDIT[]             = "Edit";
-const char MODE_EDIT_TYPE[]        = "Type.Edit";
 const char MODE_DESIGN[]           = "Design";
-const char MODE_DESIGN_TYPE[]      = "Type.Design";
 const int  P_MODE_WELCOME          = 100;
 const int  P_MODE_EDIT             = 90;
 const int  P_MODE_DESIGN           = 89;