tc-tests: Update tc police action tests for tc buffer size rounding fixes.

tc-tests: Update tc police action tests for tc buffer size rounding fixes.

Before tc's recent change to fix rounding errors, several tests which
specified a burst size of "1m" would translate back to being 1048574
bytes (2b less than 1Mb).  sprint_size prints this as "1024Kb".

With the tc fix, the burst size is instead correctly reported as
1048576 bytes (precisely 1Mb), which sprint_size prints as "1Mb".

This updates the expected output in the tests' matchPattern values
to accept either the old or the new output.

Signed-off-by: Jonathan Lennox <jonathan.lennox@8x8.com>
Link: https://patch.msgid.link/20250312174804.313107-1-jonathan.lennox@8x8.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>