fix(pp): drop signer field from trigger-resolver autocli flags

[pratikasr]

veranad tx pp trigger-resolver failed with Error: no such flag - on any
flag combination, including --dry-run.

MsgTriggerResolver declares operator as its cosmos.msg.v1.signer, but the
autocli entry also listed operator in FlagOptions without a Name. client/v2
then records SignerInfo{FlagName: ""}, skips the automatic --from wiring, and
calls MarkFlagRequired("") in RunE — pflag returns no such flag -.

Fix: drop the operator FlagOptions entry so the signer comes from --from,
matching the other pp commands. Checked all 9 modules; only occurrence.

Verified on a local chain: before no such flag -, after code 0 with the
trigger_resolver event emitted.

Closes #32