BUGFIX: ns.corporation.bribe can bribe faction that player is not member of

[catloversg]

I found this bug when checking the UI of the bribing feature. We disable the "Bribe" button when the player is not a member of any valid factions, but with ns.corporation.bribe, they can bribe a valid faction even when they are not a member of that faction. This PR fixes it.

Test save:
test bribe.gz

Test code:

/** @param {NS} ns */
export async function main(ns) {
  ns.tail();
  ns.clearLog();
  ns.print(Factions.CyberSec.playerReputation);
  ns.corporation.bribe("CyberSec", 1e12);
  ns.print(Factions.CyberSec.playerReputation);
  for (const server of GetAllServers()) {
    if (server.hostname === "CSEC") {
      server.backdoorInstalled = true;
      break;
    }
  }
  ns.singularity.checkFactionInvitations();
  ns.singularity.joinFaction("CyberSec");
  ns.corporation.bribe("CyberSec", 1e12);
  ns.print(Factions.CyberSec.playerReputation);
}

Before:

0
1000
singularity.joinFaction: Joined the 'CyberSec' faction.
2000

After:

0
corporation.bribe: You are not a member of CyberSec.
0
singularity.joinFaction: Joined the 'CyberSec' faction.
1000