Bump targetOverageBuffer to allow the relayer to fill LSK transfer re…

…quests on Lisk (#46)

### What was the problem?

This PR resolves
[LISK-1033](https://onchaincollective.atlassian.net/browse/LISK-1033)

### How was it solved?

- [x]  Bump targetOverageBuffer for LSK on Lisk

### How was it tested?

NA


[LISK-1033]:
https://onchaincollective.atlassian.net/browse/LISK-1033?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

config/mainnet/relayerExternalInventory.json

@@ -25,9 +25,9 @@
     },
     "LSK": {
       "1135": {
-        "targetPct": 30,
-        "thresholdPct": 10,
-        "targetOverageBuffer": 2.5
+        "targetPct": 10,
+        "thresholdPct": 1,
+        "targetOverageBuffer": 9
       }
     },
     "USDT": {