frontend: Fix runtime check failure issue

Fix an issue where the stack around the variable snapEnabled was
corrupted.

SPI_GETSNAPTODEFBUTTON should use BOOL, not bool.

Reference:
 * https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-systemparametersinfow
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f