fix line clear !?

app.js

@@ -798,16 +798,18 @@ function lockDown() {
         }
 
         // Cleared lines
-        let clearedLines = Array.from(new Set(blocksPosition.map(minoPosition => minoPosition.y)))
-            .filter(y =>  matrix.blocks[y].filter(lockedMino => lockedMino).length == matrix.columns)
-            .sort()
-        for (y of clearedLines) {
+        let nbClearedLines = 0
+        for (let y=0; y<matrix.rows; y++) {
+            let row = matrix.blocks[y]
+            if (row.filter(lockedMino => lockedMino).length == matrix.columns) {
                 matrix.blocks.splice(y, 1)
                 matrix.blocks.unshift(Array(matrix.columns))
                 matrix.table.rows[y].classList.add("cleared-line-animation")
             }
+        }
+
         matrix.redraw()
-        stats.lockDown(clearedLines.length, tSpin)
+        stats.lockDown(nbClearedLines, tSpin)
         
         generate()
     } else {