[lld][WebAssembly] Remove redundant config setting

Unresolved symbols are not currently reported when building with
`-shared` or `-pie` so setting unresolvedSymbols doesn't have any
effect.

Differential Revision: https://reviews.llvm.org/D117737

lld/wasm/Driver.cpp

@@ -474,7 +474,6 @@ static void setConfigs() {
   if (config->shared) {
     config->importMemory = true;
     config->importUndefined = true;
-    config->unresolvedSymbols = UnresolvedPolicy::Ignore;
   }
 }