[BUGFIX] Provide colPos for each cell in defLangBinding view

When dragging content elements in page module, the colPos
value of the dragged element is updated based on the dropped
area. A drop area is a table cell `td` in which the elements are
placed as `div`. The cell itself has the colPos set via a data
attribute. This means moving an element (`div`) to another
cell (`td`), the element gets updated with the colPos of the
new cell.

This did not work if `defLangBinding` was activated because
all elements are then assigned to separate cells which missed
the colPos information completely.

The colPos information is now added to all cells in the
`defLangBinding` view.

Resolves: #92454
Releases: master, 10.4, 9.5
Change-Id: I1ab5cb0b3dd5574b6d3397dc52397365dc59d1ee
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66393
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/backend/Classes/View/PageLayoutView.php

@@ -867,8 +867,8 @@ protected function generateLanguageView(
                     }
                     $out .= '
                         <tr>
-							<td valign="top" class="t3-grid-cell">' . implode('</td>
-							<td valign="top" class="t3-grid-cell">', $cCont) . '</td>
+							<td valign="top" class="t3-grid-cell" data-colpos="' . $cKey . '">' . implode('</td>
+                            <td valign="top" class="t3-grid-cell" data-colpos="' . $cKey . '">', $cCont) . '</td>
 						</tr>';
                 }
             }