fixed unusual terminal state after quitting

src/main.cpp

@@ -177,10 +177,10 @@ void startGame(Board &board)
             cursorX = (cursorX < boardSize.x - 1) ? cursorX + 1 : 0;
             break;
         case 'q':
-            exit(0);
             echo();
             cbreak();
             endwin();
+            exit(0);
             break;
         case 'z':
             if (!somethingHasBeenDone)
@@ -283,10 +283,10 @@ void startGame(Board &board)
                 Board newBoard(boardSize.x, boardSize.y, board.getMineCount());
                 startGame(newBoard);
             } else if(c == 'q') {
-                exit(0);
                 echo();
                 cbreak();
                 endwin();
+                exit(0);
             }
         };
     }
@@ -313,10 +313,10 @@ void startGame(Board &board)
                 Board newBoard(boardSize.x, boardSize.y, board.getMineCount());
                 startGame(newBoard);
             } else if(c == 'q') {
-                exit(0);
                 echo();
                 cbreak();
                 endwin();
+                exit(0);
             }
         };
     }