[C++][Parquet] FormatStatValue appends trailing space to string and int96

[asfimport]

The function FormatStatValue appends a trailing space to string and int96 statistics.

Reporter: Julius Neuffer / @jneuff
Assignee: Julius Neuffer / @jneuff

PRs and other links:

• GitHub Pull Request #461

_{Note: This issue was originally created as PARQUET-1283. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 461
apache/parquet-cpp#461