add missing disableParamFiltering in test_graphql.nim

if there is no `disableParamFiltering()`, and the test is run via
all_tests.nim, no test unit will be executed

tests/test_graphql.nim

@@ -8,7 +8,7 @@
 # those terms.
 
 import
- std/[os, json],
+ std/[os, json, unittest],
  stew/byteutils,
  eth/[p2p, common, trie/db, rlp, trie],
  eth/p2p/rlpx_protocols/eth_protocol,
@@ -98,6 +98,7 @@ proc graphqlMain*() =
  when isMainModule:
  ctx.main(caseFolder, purgeSchema = false)
  else:
+ disableParamFiltering()
  ctx.executeCases(caseFolder, purgeSchema = false)
 
 when isMainModule: