fix: f3: topic filter with no static manifest

[Kubuxu]

The code would only allow the main network pubsub topic if the static manifest were specified.
Not sure how that slipped through my manual tests. I think I was testing it with the code that was overriding static manifest with contract one, and only later I made the two options exclusive.

[rjan90]

Updating the Butterfly network nodes to this branch got F3 unblocked:

lotus f3 status
Running: true
Progress:
  Instance: 53
  Round:    0
  Phase:    INITIAL
Manifest:
  Protocol Version:     6
  Paused:               false
  Initial Instance:     0
  Initial Power Table:  bafy2bzacedrwea2z2orechafcuyrvgxteebx2snpipwjx6mmfyssfzsqjhzf4
  Bootstrap Epoch:      29000
  Network Name:         butterflynet
  Ignore EC Power:      false
  Committee Lookback:   10
  Catch Up Alignment:   15s

  GPBFT Delta:                        6s
  GPBFT Delta BackOff Exponent:       2
  GPBFT Quality Delta Multiplier:     1
  GPBFT Max Lookahead Rounds:         5
  GPBFT Chain Proposed Length:        100
  GPBFT Rebroadcast Backoff Base:     6s
  GPBFT Rebroadcast Backoff Exponent: 1.3
  GPBFT Rebroadcast Backoff Spread:   0.1
  GPBFT Rebroadcast Backoff Max:      1m0s

  EC Period:            30s
  EC Finality:          900
  EC Delay Multiplier:  2
  EC Head Lookback:     0
  EC Finalize:          true

  Certificate Exchange Client Timeout:    10s
  Certificate Exchange Server Timeout:    1m0s
  Certificate Exchange Min Poll Interval: 30s
  Certificate Exchange Max Poll Interval: 2m0s

  PubSub Compression Enabled:  false

  Chain Exchange Subscription Buffer Size:           32
  Chain Exchange Max Chain Length:                   100
  Chain Exchange Max Instance Lookahead:             10
  Chain Exchange Max Discovered Chains Per Instance: 1000
  Chain Exchange Max Wanted Chains Per Instance:     1000
  Chain Exchange Rebroadcast Interval:               2s
  Chain Exchange Max Timestamp Age:                  8s

A sanity ✅ from Masih would be great though