LibWeb: Account for floats when computing IFC abspos static position #30924

Job	Run time
macOS, arm64, Sanitizer, Clang / CI	30m 2s
Windows, x86_64, Sanitizer, ClangCL / CI	5m 17s
Linux, arm64, Sanitizer, Clang / CI	48m 10s
Linux, x86_64, Fuzzers, Clang / CI	11m 6s
Linux, x86_64, All_Debug, Clang / CI	13m 29s
Linux, x86_64, Release, GNU / CI	17m 6s
Linux, x86_64, Sanitizer, Clang / CI	20m 24s
	2h 25m 34s

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