kwin_bridge: Load DecorationButton without the "button" keyword
Plugin keywords have been deprecated. Breeze and Oxygen no longer use the "button" keyword when registering their button plugins, so loading them now fails and blank assets get generated. Attempt loading DecorationButton without using the keyword, and if this fails, try the deprecated keyword like in the KWin commit 6f110bca. BUG: 442659
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b36ccafd