Linux: remove historic bourne shell argument expansion workaround

This is a history workaround not needed for modern shells
(fixed with bourne shell SRV3, 1986).

This isn't used in other wrappers (snap package) for e.g.

release/bin/blender-launcher

@@ -9,4 +9,4 @@ LD_LIBRARY_PATH=${BF_DIST_BIN}/lib:${LD_LIBRARY_PATH}
 
 export LD_LIBRARY_PATH
 
-exec "$BF_DIST_BIN/$BF_PROGRAM" ${1+"$@"}
+exec "$BF_DIST_BIN/$BF_PROGRAM" "$@"

release/bin/blender-softwaregl

@@ -19,4 +19,4 @@ XLIB_SKIP_ARGB_VISUALS=1
 
 export LD_LIBRARY_PATH LD_LIBRARYN32_PATH LD_LIBRARYN64_PATH LD_LIBRARY_PATH_64 LD_PRELOAD XLIB_SKIP_ARGB_VISUALS
 
-exec "$BF_DIST_BIN/$BF_PROGRAM" ${1+"$@"}
+exec "$BF_DIST_BIN/$BF_PROGRAM" "$@"