Fix issue where `set_global_position(global_position)` in `Control` resulted in a different result than `global_position` #20447

Job	Run time
📊 Static checks / Code style, file formatting, and docs	39s
🍎 macOS / Editor (target=editor, tests=yes)	5m 51s
🍎 macOS / Template (target=template_release)	3m 49s
🍏 iOS / Template (target=template_release)	2m 46s
🤖 Android / Template (target=template_release)	3m 25s
🐧 Linux / Editor w/ Mono (target=editor)	3m 32s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	13m 2s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	6m 20s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	5m 40s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	1m 23s
🏁 Windows / Editor (target=editor, tests=yes)	7m 54s
🐧 Linux / Template w/ Mono (target=template_release)	1m 15s
🌐 Web / Template w/o threads (target=template_release, threads=no)	1m 7s
🏁 Windows / Template (target=template_release)	7m 1s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 26s
🪲 Godot CPP / Build and test Godot CPP	6m 48s
	1h 11m 58s

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