Specifically describe anchors as Sprout anchors.

src/gtest/test_mempool.cpp

@@ -55,7 +55,7 @@ public:
     bool BatchWrite(CCoinsMap &mapCoins,
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
-                    CAnchorsMap &mapAnchors,
+                    CAnchorsSproutMap &mapSproutAnchors,
                     CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap &mapSaplingNullifiers) {
         return false;

src/gtest/test_validation.cpp

@@ -50,7 +50,7 @@ public:
     bool BatchWrite(CCoinsMap &mapCoins,
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
-                    CAnchorsMap &mapAnchors,
+                    CAnchorsSproutMap &mapSproutAnchors,
                     CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap saplingNullifiersMap) {
         return false;