Investigate spaces in cli listsinceblock output

### Describe the issue

At least once, gamblecoin-cli listsinceblock reported a TX with trailing spaces before the closing quote.

### Can you reliably reproduce the issue?

No. Seen once, but could be related to parsing issues.

### Expected behavior
No whitespace between the quotes

### Actual behavior
Trailing whitespace at least once.

### Screenshots.
Coming later.

### What version of GambleCoin Core are you using?
newly updated 1.1.4

### Machine specs:
- OS: Linux Ubuntu