Fix disabling blend mode combo for MyPaint brushes
MyPaint brushes don't support custom blend modes, they always use what MyPaint calls "Normal and Erase". The code already made an attempt to disable the blend mode combo box to represent that, but switching tools caused it to re-enable itself, despite having no effect. This commit fixes that: the brush blend mode combo box gets disabled upon switching tools if a MyPaint brush preset is selected. It also adds a comment explaining the reason behind that rather non-obvious special case. BUG: 445206 (cherry picked from commit 1576bf60)
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