Remove useless check for grid size in wxGrid::FreezeTo()

This resulted in silently doing nothing when calling FreezeTo() on a
grid which hadn't been resized to its full size yet, which seems wrong
and not useful at all, so simply remove this check and freeze the
requested rows/columns in any case -- it's the user responsibility to
make the grid sufficiently big to allow the user to see the non-frozen
parts.

interface/wx/grid.h

@@ -5644,7 +5644,6 @@ public:
         Note that this method doesn't do anything, and returns @false, if any
         of the following conditions are true:
         - Either @a row or @a col are out of range
-        - Size of the frozen area would be bigger than the current viewing area
         - There are any merged cells in the area to be frozen
         - Grid uses a native header control (see UseNativeColHeader())
 

src/generic/grid.cpp

@@ -5459,17 +5459,6 @@ bool wxGrid::FreezeTo(int row, int col)
     // freeze
     if ( row > m_numFrozenRows || col > m_numFrozenCols )
     {
-        // check that it fits in client size
-        int cw, ch;
-        GetClientSize( &cw, &ch );
-
-        cw -= m_rowLabelWidth;
-        ch -= m_colLabelHeight;
-
-        if ((row > 0 && GetRowBottom(row - 1) >= ch) ||
-            (col > 0 && GetColRight(col - 1) >= cw))
-            return false;
-
         // check all involved cells for merged ones
         int cell_rows, cell_cols;