internal/ethapi: eth_call block parameter is optional (#28165)

So apparently in the spec the base block parameter of eth_call is optional.
I agree that "latest" is a sane default for this that most people would use.

internal/ethapi/api_test.go

@@ -846,7 +846,7 @@ func TestCall(t *testing.T) {
 		},
 	}
 	for i, tc := range testSuite {
-		result, err := api.Call(context.Background(), tc.call, rpc.BlockNumberOrHash{BlockNumber: &tc.blockNumber}, &tc.overrides, &tc.blockOverrides)
+		result, err := api.Call(context.Background(), tc.call, &rpc.BlockNumberOrHash{BlockNumber: &tc.blockNumber}, &tc.overrides, &tc.blockOverrides)
 		if tc.expectErr != nil {
 			if err == nil {
 				t.Errorf("test %d: want error %v, have nothing", i, tc.expectErr)