Revert "qoraHoldersShare reworked to qoraHoldersShareByHeight."

This reverts commit 90e8cfc737.

# Conflicts:
#	src/test/java/org/qortal/test/minting/RewardTests.java

src/test/resources/test-chain-v2-qora-holder-extremes.json

@@ -30,10 +30,7 @@
 		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
 		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 5, "share": 0.01 }
-	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
 	"minAccountsToActivateShareBin": 30,
 	"shareBinActivationMinLevel": 7,