chore: align snapshot error text

Co-authored-by: Deejae69 <179696940+Deejae69@users.noreply.github.com>
Agent-Logs-Url: https://github.com/Deejae69/nethermind/sessions/dca6063e-0d71-4707-af2a-aad7ffcd5f30

Author: Copilot

src/Nethermind/Nethermind.Xdc.Test/XdcSealValidatorTests.cs

@@ -275,7 +275,7 @@ public void ValidateParams_EmptyMasternodes_ReturnsFalse()
         XdcSealValidator validator = new XdcSealValidator(Substitute.For<ISnapshotManager>(), epochSwitchManager, specProvider);
 
         Assert.That(validator.ValidateParams(parent, header, out var error), Is.False);
-        Assert.That(error, Does.Contain("Snap shot returned no master nodes"));
+        Assert.That(error, Does.Contain("Snapshot returned no master nodes"));
     }
 
     private static QuorumCertificate CreateQc(BlockRoundInfo roundInfo, PrivateKey[] keys, ulong gapNumber)

src/Nethermind/Nethermind.Xdc/XdcSealValidator.cs

@@ -103,7 +103,7 @@ public bool ValidateParams(BlockHeader parent, BlockHeader header, out string er
             masternodes = epochSwitchInfo.Masternodes;
             if (masternodes is null || masternodes.Length == 0)
             {
-                error = $"Snap shot returned no master nodes for header \n{xdcHeader}";
+                error = $"Snapshot returned no master nodes for header \n{xdcHeader}";
                 return false;
             }
         }