[gimp] app: remove duplicate GIMP_HELP_TOOL_CURVES define

[Jacob Boerema <jboerema src gnome org>]

commit 6cb58fbc8de0050fda45770aa61fbf611d86b074
Author: Jacob Boerema <jgboerema gmail com>
Date:   Sat Oct 15 16:32:20 2022 -0400

    app: remove duplicate GIMP_HELP_TOOL_CURVES define
    
    This caused a missing documentation warning for help id gimp-tool-curves
    in gimp-help.

 app/widgets/gimphelp-ids.h | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/app/widgets/gimphelp-ids.h b/app/widgets/gimphelp-ids.h
index 32f38e31c4..11ff1d67fa 100644
--- a/app/widgets/gimphelp-ids.h
+++ b/app/widgets/gimphelp-ids.h
@@ -301,7 +301,6 @@
 #define GIMP_HELP_TOOL_CONVOLVE                   "gimp-tool-convolve"
 #define GIMP_HELP_TOOL_CROP                       "gimp-tool-crop"
 #define GIMP_HELP_TOOL_CURVES                     "gimp-tool-curves"
-#define GIMP_HELP_TOOL_CURVES                     "gimp-tool-curves"
 #define GIMP_HELP_TOOL_DODGE_BURN                 "gimp-tool-dodge-burn"
 #define GIMP_HELP_TOOL_ELLIPSE_SELECT             "gimp-tool-ellipse-select"
 #define GIMP_HELP_TOOL_ERASER                     "gimp-tool-eraser"