patch 9.0.2005: partially revert patch v9.0.1997

Problem:  partially revert patch v9.0.1997
Solution: add a comment, to make clear it's not used

related: #13288

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/move.c b/src/move.c
index a0d3a60..42878e4 100644
--- a/src/move.c
+++ b/src/move.c
@@ -1753,7 +1753,12 @@
 	    ++row;
 	}
 	if (col > width2 && width2 > 0)
+	{
 	    row += col / width2;
+	    // even so col is not used anymore,
+	    // make sure it is correct, just in case
+	    col = col % width2;
+	}
 	if (row >= curwin->w_height)
 	{
 	    curwin->w_curswant = curwin->w_virtcol
@@ -1986,7 +1991,12 @@
 	++row;
     }
     if (col > width2)
+    {
 	row += col / width2;
+	// col may no longer be used, but make
+	// sure it is correct anyhow, just in case
+	col = col % width2;
+    }
     if (row >= curwin->w_height)
     {
 	if (curwin->w_skipcol == 0)