OcVariableRuntimeLib: Fix SectionGuid formatting, thx @Goldfish64

Changelog.md

 OpenCore Changelog
 ==================
+#### v0.9.5
+- Fixed GUID formatting for legacy NVRAM saving
+
 #### v0.9.4
 - Fixed kext blocker `Exclude` strategy for prelinked on 32-bit versions of macOS
 - Fixed `ForceAquantiaEthernet` quirk on macOS 14 beta 2, thx @Shikumo

Library/OcVariableRuntimeLib/OcVariableRuntimeLib.c

@@ -465,7 +465,7 @@ SaveNvram (
                Context.StringBuffer,
                "\t\t<key>%g</key>%c"
                "\t\t<dict>%c",
-               Context.SectionGuid,
+               &Context.SectionGuid,
                '\n',
                '\n'
                );