[LLD][ELF] - Update test after yaml2obj change. NFC.

Names of YAML keys changed in rG7a587ca93200c49e47fe205ce037895c81c5a542
diff --git a/lld/test/ELF/invalid/invalid-e_shnum.test b/lld/test/ELF/invalid/invalid-e_shnum.test
index 7c04c10..4e622ac 100644
--- a/lld/test/ELF/invalid/invalid-e_shnum.test
+++ b/lld/test/ELF/invalid/invalid-e_shnum.test
@@ -10,6 +10,6 @@
   Data:      ELFDATA2LSB
   Type:      ET_REL
   Machine:   EM_X86_64
-  SHOff:     0
-  SHNum:     0x1
-  SHStrNdx:  0
+  EShOff:    0
+  EShNum:    0x1
+  EShStrNdx: 0