fix(compiler): Generates function expressions as returning any (#9980)

Function expressions are used in an expression context so untyped
function expressions should have any as the result type.

Fixes: #9877

modules/@angular/compiler/src/output/ts_emitter.ts

@@ -170,7 +170,7 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
     ctx.print(`(`);
     this._visitParams(ast.params, ctx);
     ctx.print(`):`);
-    this.visitType(ast.type, ctx, 'void');
+    this.visitType(ast.type, ctx);
     ctx.println(` => {`);
     ctx.incIndent();
     this.visitAllStatements(ast.statements, ctx);