Fix key release masks for A, Y1 (Sys1) and Y253 (Sys2)

These commands should wait for release of all direction keys + RETURN,
instead of only RIGHT and RETURN.

src/sys/nact.cpp

@@ -424,7 +424,7 @@ void NACT::cmd_a()
 	}
 	sys_sleep(30);
 	if (!msgskip->skipping()) {
-		wait_key_release(0x18);
+		wait_key_release(0x1f);
 	}
 
 	// ウィンドウ更新

src/sys/nact_sys1.cpp

@@ -744,7 +744,7 @@ public:
 				sys_sleep(16);
 			}
 			sys_sleep(100);
-			wait_key_release(0x18);
+			wait_key_release(0x1f);
 			ags->clear_text_window(text_window, true);
 			break;
 		case 2:

src/sys/nact_sys2.cpp

@@ -805,7 +805,7 @@ void NACT_Sys2::cmd_y()
 				sys_sleep(16);
 			}
 			sys_sleep(100);
-			wait_key_release(0x18);
+			wait_key_release(0x1f);
 			break;
 		case 254:
 			RND = 0;