Do not look up old ColorEntry in editColorItem

5bc0b561c4 changed ColorEntry from a
wrapper around QColor to a typedef.  Before that change, the wrapper
needed to exist and have its color property set to the new color.

Now, there is no reason to access the old color at all.  Entirely
remove the vestigial code.

Signed-off-by: Antonio Russo <aerusso@aerusso.net>

src/colorscheme/ColorSchemeEditor.cpp

@@ -174,9 +174,7 @@ void ColorSchemeEditor::editColorItem(QTableWidgetItem *item)
             colorSchemeRow += 2*COLOR_TABLE_ROW_LENGTH;
         }
 
-        QColor entry(_colors->colorEntry(colorSchemeRow));
-        entry = color;
-        _colors->setColorTableEntry(colorSchemeRow, entry);
+        _colors->setColorTableEntry(colorSchemeRow, color);
 
         emit colorsChanged(_colors);
     }