tests: format JSON consistently

test/fixtures/transaction_builder.json

@@ -194,11 +194,11 @@
     "fromTransaction": [
       {
         "exception": "coinbase inputs not supported",
-        "hex":"01000000010000000000000000000000000000000000000000000000000000000000000000000000006b483045022100a3b254e1c10b5d039f36c05f323995d6e5a367d98dd78a13d5bbc3991b35720e022022fccea3897d594de0689601fbd486588d5bfa6915be2386db0397ee9a6e80b601210279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798ffffffff0110270000000000001976a914aa4d7985c57e011a8b3dd8e0e5a73aaef41629c588ac00000000" 
+        "hex": "01000000010000000000000000000000000000000000000000000000000000000000000000000000006b483045022100a3b254e1c10b5d039f36c05f323995d6e5a367d98dd78a13d5bbc3991b35720e022022fccea3897d594de0689601fbd486588d5bfa6915be2386db0397ee9a6e80b601210279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798ffffffff0110270000000000001976a914aa4d7985c57e011a8b3dd8e0e5a73aaef41629c588ac00000000"
       },
       {
         "exception": "nonstandard inputs not supported",
-        "hex": "0100000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000000023aa206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d619000000000087ffffffff0110270000000000001976a914aa4d7985c57e011a8b3dd8e0e5a73aaef41629c588ac00000000" 
+        "hex": "0100000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000000023aa206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d619000000000087ffffffff0110270000000000001976a914aa4d7985c57e011a8b3dd8e0e5a73aaef41629c588ac00000000"
       }
     ]
   }