dropbear: really fix xauth tweak since dbcec2b2

Commit d5576fd2 tried to fix this, but introduced a new typo.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dropbear/dropbear.mk

@@ -21,7 +21,7 @@ define DROPBEAR_FIX_XAUTH
 	$(SED) 's,^#define XAUTH_COMMAND.*/xauth,#define XAUTH_COMMAND "/usr/bin/xauth,g' $(@D)/options.h
 endef
 
-DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_FIX_AUTH
+DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_FIX_XAUTH
 
 define DROPBEAR_DISABLE_REVERSE_DNS
 	$(SED) 's,^#define DO_HOST_LOOKUP.*,/* #define DO_HOST_LOOKUP */,' $(@D)/options.h