Replace the 2 occurences of Navigation by Navigator

and get rid of:
warn:legacy.osl:10410:10410:sfx2/source/control/msgpool.cxx:211: GroupId-Name not defined in SFX!

Indeed "Navigation" isn't taken into account in getGidResId from msgpool.cxx (sfx2)

Change-Id: Ie5d54175106c1ca835a487ccfe2a38f3f21dc93d
Reviewed-on: https://gerrit.libreoffice.org/50400Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

include/sfx2/groupid.hxx

@@ -49,8 +49,7 @@ enum class SfxGroupId {
     Connector,
     Modify,
     Drawing,
-    Controls,
-    Navigation
+    Controls
 };
 
 // make it hashable for storing in maps

sw/sdi/swriter.sdi

@@ -7397,7 +7397,7 @@ SfxVoidItem NavigateBack FN_NAVIGATION_BACK
     AccelConfig = TRUE,
     MenuConfig = TRUE,
     ToolBoxConfig = TRUE,
-    GroupId = SfxGroupId::Navigation;
+    GroupId = SfxGroupId::Navigator;
 ]
 
 SfxVoidItem NavigateForward FN_NAVIGATION_FORWARD
@@ -7415,7 +7415,8 @@ SfxVoidItem NavigateForward FN_NAVIGATION_FORWARD
     AccelConfig = TRUE,
     MenuConfig = TRUE,
     ToolBoxConfig = TRUE,
-    GroupId = SfxGroupId::Navigation;
+    GroupId = SfxGroupId::Navigator;
+
 ]
 
 SfxStringItem OpenFromWriter FN_OPEN_FILE