Fix MATRIX_HAS_GHOST when MATRIX_COL > 16

When MATRIX_COL > 16 get_real_keys() does not work correctly because the
1 << col overflows, since matrix_row_t is uint32_t. This causes
  keypresses to be lost on keyboards with more than 16 columns.

quantum/keyboard.c

@@ -171,9 +171,9 @@ static matrix_row_t get_real_keys(uint8_t row, matrix_row_t rowdata) {
     matrix_row_t out = 0;
     for (uint8_t col = 0; col < MATRIX_COLS; col++) {
         // read each key in the row data and check if the keymap defines it as a real key
-        if (keycode_at_keymap_location(0, row, col) && (rowdata & (1 << col))) {
+        if (keycode_at_keymap_location(0, row, col) && (rowdata & (((matrix_row_t)1) << col))) {
             // this creates new row data, if a key is defined in the keymap, it will be set here
-            out |= 1 << col;
+            out |= ((matrix_row_t)1) << col;
         }
     }
     return out;