fix(sbpf): disagreements with FD fixtures

[sonicfromnewyoke]

Problem

sbpf package has a lot of disagreements with FD fixtures

Summary of Changes

• match logic with FD
• fix all the disagreements from FD fixtures. Conformance rate 29.9% -> 100%

output of make test-conformance-elf command:

go test ./conformance/ -run TestConformance_ElfLoader_Firedancer -v
=== RUN   TestConformance_ElfLoader_Firedancer
    elf_loader_fb_test.go:57: Found 953 ELF loader fixtures
    elf_loader_fb_test.go:179: 
        === ELF Loader Conformance Results ===
    elf_loader_fb_test.go:180: Total fixtures:     953
    elf_loader_fb_test.go:181: Parse errors:       0
    elf_loader_fb_test.go:182: Both pass:          742
    elf_loader_fb_test.go:183: Both fail:          211
    elf_loader_fb_test.go:184: False pass (bad):   0 (mithril loads, fixture rejects)
    elf_loader_fb_test.go:185: False fail (bad):   0 (mithril rejects, fixture loads)
    elf_loader_fb_test.go:186: Panics (crash bug): 0
    elf_loader_fb_test.go:187: Entry PC match:     742 / 742
    elf_loader_fb_test.go:188: Text count match:   742 / 742
    elf_loader_fb_test.go:212: 
        Conformance rate: 100.0% (953/953)
--- PASS: TestConformance_ElfLoader_Firedancer (0.16s)
PASS
ok      github.com/Overclock-Validator/mithril/conformance      0.499s

cc @smcio @7layermagik