Remove temporary patch for Wasmer

[Michael Bryan]

In #310, we patched our wasmer dependency so we could use the fix from wasmerio/wasmer#3400 and publish it to NPM.

wasmer-js/Cargo.toml

Lines 25 to 30 in 96a846e

 # TODO(Michael-F-Bryan): Remove this when Wasmer 3.1 comes out 
 # See https://github.com/wasmerio/wasmer-js/issues/312 for more. 
 [patch.crates-io] 
 wasmer = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["js", "std"], rev = "ecde2aa" } 
 wasmer-wasi = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["js"], rev = "ecde2aa" } 
 wasmer-vfs = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["mem-fs"], rev = "ecde2aa" } 

When Wasmer 3.1 comes out, we'll need to remove the patch and switch back to wasmer from crates.io.