Play Keyboard Helen 80: fix matrix mapping (#11585)

keyboards/playkbtw/helen80/helen80.h

@@ -30,7 +30,7 @@
     { K10,   K11,   K12,   K13,   K14,   K15,   K16,   K17,   K18,   K19,   K1A,   K1B,   K1C,          K1E   }, \
     { K20,   K21,   K22,   K23,   K24,   K25,   K26,   K27,   K28,   K29,   K2A,   K2B,   K2C,   K2D,   K2E   }, \
     { K30,   K31,   K32,   K33,   K34,   K35,   K36,   K37,   K38,   K39,   K3A,   K3B,   K3C,   K3D,   K3E   }, \
-    { K40,   K41,   K42,   K43,   K44,   K45,   K46,   K47,   K48,   K49,   K4A,   K4B,   K4C                 }, \
+    { K40,   KC_NO, K41,   K42,   K43,   K44,   K45,   K46,   K47,   K48,   K49,   K4A,   K4B,   KC_NO, K4C   }, \
     { K50,   K51,   K52,   K53,   K54,   K55,   K56,   K57,   K58,   K59,   K5A,   K5B,   K5C,   K5D,   K5E   }, \
 }