known-issues: update rule for TCF summary line

TCF now prints more detail in the summary line to conform with the
rest of the lines to ease up parsing; update said line to filter it
properly.

Change-Id: I7c21eea18a67dbfd027d680036762546556f90db
Signed-off-by: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>