Fix `FastNoiseLite.get_seamless_image` function crash with bad param #14439

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 0s
🍏 iOS / Template (target=template_release)	2m 48s
🐧 Linux / Editor w/ Mono (target=editor)	5m 59s
🍎 macOS / Editor (target=editor, tests=yes)	5m 30s
🐧 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)	14m 35s
🍎 macOS / Template (target=template_release)	30m 23s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	8m 43s
🌐 Web / Template (target=template_release)	1m 35s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	12m 43s
🤖 Android / Template (target=template_release)	4m 37s
🐧 Linux / Template w/ Mono (target=template_release)	2m 31s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 46s
🏁 Windows / Editor (target=editor, tests=yes)	11m 20s
🏁 Windows / Template (target=template_release)	8m 33s
🪲 Godot CPP / Build and test Godot CPP	13m 59s
	2h 6m 2s

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