Merge tari-project#2179: Fix geometric mean comparison halting the bl…

…ockchain

When geometric mean of a new block is compared to that of the network, it must
be accepted if it is equal, due to the number being rounded. `geo_mean =
sqrt(achieved_difficulty_01 ^ 2 x achieved_difficulty_02 ^ 2)` (tari-project#2179) Merge
pull request tari-project#2179

base_layer/core/src/validation/accum_difficulty_validators.rs

@@ -35,7 +35,7 @@ impl<B: BlockchainBackend> Validation<Difficulty, B> for AccumDifficultyValidato
         let tip_header = db
             .fetch_last_header()?
             .ok_or_else(|| ValidationError::custom_error("Cannot retrieve tip header. Blockchain DB is empty"))?;
-        if *accum_difficulty <= tip_header.total_accumulated_difficulty_inclusive() {
+        if *accum_difficulty < tip_header.total_accumulated_difficulty_inclusive() {
             return Err(ValidationError::WeakerAccumulatedDifficulty);
         }
         Ok(())