Fix to iconbar menu X offset

Detail:
  The fix applied to all menus in event.c revision 4.6 didn't take into account the offset of -16 already applied to iconbar menus.
Admin:
  Tested with Draw-1_31.

Version 5.99. Tagged as 'RISC_OSLib-5_99'

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "5.98"
-Module_Version          SETA    598
+Module_MajorVersion     SETS    "5.99"
+Module_Version          SETA    599
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "26 Jan 2019"
-Module_ApplicationDate  SETS    "26-Jan-19"
+Module_Date             SETS    "09 Feb 2019"
+Module_ApplicationDate  SETS    "09-Feb-19"
 Module_ComponentName    SETS    "RISC_OSLib"
 Module_ComponentPath    SETS    "apache/RiscOS/Sources/Lib/RISC_OSLib"
-Module_FullVersion      SETS    "5.98"
-Module_HelpVersion      SETS    "5.98 (26 Jan 2019)"
+Module_FullVersion      SETS    "5.99"
+Module_HelpVersion      SETS    "5.99 (09 Feb 2019)"
                         END

VersionNum

-/* (5.98)
+/* (5.99)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        5.98
+#define Module_MajorVersion_CMHG        5.99
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                26 Jan 2019
+#define Module_Date_CMHG                09 Feb 2019
 
-#define Module_MajorVersion             "5.98"
-#define Module_Version                  598
+#define Module_MajorVersion             "5.99"
+#define Module_Version                  599
 #define Module_MinorVersion             ""
-#define Module_Date                     "26 Jan 2019"
+#define Module_Date                     "09 Feb 2019"
 
-#define Module_ApplicationDate          "26-Jan-19"
+#define Module_ApplicationDate          "09-Feb-19"
 
 #define Module_ComponentName            "RISC_OSLib"
 #define Module_ComponentPath            "apache/RiscOS/Sources/Lib/RISC_OSLib"
 
-#define Module_FullVersion              "5.98"
-#define Module_HelpVersion              "5.98 (26 Jan 2019)"
-#define Module_LibraryVersionInfo       "5:98"
+#define Module_FullVersion              "5.99"
+#define Module_HelpVersion              "5.99 (09 Feb 2019)"
+#define Module_LibraryVersionInfo       "5:99"

rlib/c/event

@@ -169,7 +169,6 @@ static BOOL event__process(wimp_eventstr *e)
       if (event__current_menu_window == win_ICONBAR)
       {
         /* move icon bar menus up a bit. */
-        e->data.but.m.x -= 16 /* m->width/2 */;
         e->data.but.m.y = 96;
         {
           wimp_menuitem *mi = (wimp_menuitem*) (m + 1);