[LLDB][test] - Fix test after yaml2obj change.

D95354 started to set the sh_link field for SHT_SYMTAB sections.
Previously it was set for symbol tables basing on their names (e.g. ".symtab").

This test now crashes see:
http://lab.llvm.org:8011/#/builders/68/builds/5911

I updated it to restore the old behavior.

lldb/test/Shell/ObjectFile/ELF/section-types-edgecases.yaml

@@ -30,6 +30,7 @@ Sections:
   - Name:            .text
     Type:            SHT_SYMTAB
     Flags:           [ ]
+    Link:            0
     AddressAlign:    0x0000000000000004
     Content:         DEADBEEFBAADF00D
 ...