Remove useless IsCellEditControlEnabled() checks

There is no need to do this before calling DisableCellEditControl() as
it won't do anything if the cell edit control is already disabled.

src/generic/grid.cpp

@@ -5222,8 +5222,7 @@ void wxGrid::ClearGrid()
 {
     if ( m_table )
     {
-        if (IsCellEditControlEnabled())
-            DisableCellEditControl();
+        DisableCellEditControl();
 
         m_table->Clear();
         if ( ShouldRefresh() )
@@ -5240,8 +5239,7 @@ wxGrid::DoModifyLines(bool (wxGridTableBase::*funcModify)(size_t, size_t),
     if ( !m_table )
         return false;
 
-    if ( IsCellEditControlEnabled() )
-        DisableCellEditControl();
+    DisableCellEditControl();
 
     return (m_table->*funcModify)(pos, num);