multisig: fix #8537 seed restore (suggestions by @UkoeHB)

- spend secret key is no longer the sum of multisig key shares;
no need to check that is the case upon restore.
- restoring a multisig wallet from multisig info means that the
wallet must have already completed all setup rounds. Upon restore,
set the number of rounds completed accordingly.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/multisig/multisig_account.cpp b/src/multisig/multisig_account.cpp
index 9bdcf2dbc..f3e78da18 100644
--- a/src/multisig/multisig_account.cpp
+++ b/src/multisig/multisig_account.cpp
@@ -127,7 +127,7 @@ namespace multisig
   bool multisig_account::multisig_is_ready() const
   {
     if (main_kex_rounds_done())
-      return m_kex_rounds_complete >= multisig_kex_rounds_required(m_signers.size(), m_threshold) + 1;
+      return m_kex_rounds_complete >= multisig_setup_rounds_required(m_signers.size(), m_threshold);
     else
       return false;
   }
@@ -200,4 +200,11 @@ namespace multisig
     return num_signers - threshold + 1;
   }
   //----------------------------------------------------------------------------------------------------------------------
+  // EXTERNAL
+  //----------------------------------------------------------------------------------------------------------------------
+  std::uint32_t multisig_setup_rounds_required(const std::uint32_t num_signers, const std::uint32_t threshold)
+  {
+    return multisig_kex_rounds_required(num_signers, threshold) + 1;
+  }
+  //----------------------------------------------------------------------------------------------------------------------
 } //namespace multisig