[TinyMCE] Fix windowManager attribute name in Editor type
[TinyMCE] Fix windowManager attribute name in Editor type

Since it is a property of the Editor, it should follow the standard
followed by other properties: first letter should be lowercase

Signed-off-by: Thiago Lacerda <c9070c0662f99e980d56ca38a6b1c40a8f1708a0@gmail.com>

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