Fix hex encoding for eth_getStorageAt (#344)

Author: somnathb1

integration/mainnet/eth_getStorageAt/test_01.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x6C8f2A135f6ed072DE4503Bd7C4999a1a17F824B", "0x0000000000000000000000000000000000000000000000000000000000000001", "0x112A87f"],
+            "params":["0x6C8f2A135f6ed072DE4503Bd7C4999a1a17F824B", "0x1", "0x112A87f"],
             "id":1
         },
         "response": {

integration/mainnet/eth_getStorageAt/test_02.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x8D92A6812b3dA2346883F0631910c96Cb9c5a5f9", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x104A3FA"],
+            "params":["0x8D92A6812b3dA2346883F0631910c96Cb9c5a5f9", "0x0", "0x104A3FA"],
             "id":1
         },
         "response": {

integration/mainnet/eth_getStorageAt/test_03.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x8D92A6812b3dA2346883F0631910c96Cb9c5a5f9", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x104A3F9"],
+            "params":["0x8D92A6812b3dA2346883F0631910c96Cb9c5a5f9", "0x0", "0x104A3F9"],
             "id":1
         },
         "response": {

integration/mainnet/eth_getStorageAt/test_04.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x0000000000000000000000000000000000000000000000000000000000000000", "latest"],
+            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x0", "latest"],
             "id":1
         },
         "response": {

integration/mainnet/eth_getStorageAt/test_05.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x0000000000000000000000000000000000000000000000000000000000000000", "earliest"],
+            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x0", "earliest"],
             "id":1
         },
         "response": {

integration/mainnet/eth_getStorageAt/test_06.json

@@ -3,7 +3,7 @@
         "request": {
             "jsonrpc":"2.0",
             "method":"eth_getStorageAt",
-            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x0000000000000000000000000000000000000000000000000000000000000001", "earliest"],
+            "params":["0x8cED5ad0d8dA4Ec211C17355Ed3DBFEC4Cf0E5b9", "0x1", "earliest"],
             "id":1
         },
         "response": {