Adjust error fixtures to nightly changes (#898)

* Adjust error fixtures to nightly changes

* Update fixtures for `nightly-2021-08-13`
21 jobs for master in 12 minutes and 10 seconds (queued for 7 seconds)
Name Stage Failure
failed
test Workspace
test src/lib.rs - StorageLayout (line 139) ... ok
test src/lib.rs - SpreadLayout (line 70) ... ok
test src/lib.rs - PackedLayout (line 103) ... ok

test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.87s

error: test failed, to rerun pass '-p ink_lang_macro --test compile_tests'
Cleaning up file based variables
ERROR: Job failed: exit code 1