BUG/MEDIUM: tcp-rules: Don't restart tcp-request content evaluation on yield

BUG/MEDIUM: tcp-rules: Don't restart tcp-request content evaluation on yield

The commit 9f1e9ee0e ("DEBUG: stream: Display the currently running rule in
stream dump") introduced a regression. The currently evaluated "tcp-request
content" rule was reset on resume while it should not. If it yielded again,
the rules evaluation was restarted to the first rule.

The "tcp-response content" rule evaluation was properly modified by the
commit above. The same must be performed gor the "tcp-request content" rule
evaluation.

This patch should fix the issue #3496. It must be backported as far as 3.2.