String template is proposed for JSON string without any need

Hi,

for this code:

```abap
DATA(lv_json) = `{"a":"b", ` && `"c":{}}`.
```

abap-cleaner proposes without any need string templates:

```abap
DATA(lv_json) = |\{"a":"b", "c":\{\}\}|.
```

On one side, the unnecessary string templates causes runtime costs and on the other
side the JSON syntax becomes quite hard to read because of the escaping of the bracelets.

Kind regards
André