fix: add system transaction check in collect_system_reward

[pythonberg1997]

Description

This pr is to fix an error within post execution handler for bsc system transaction

Rationale

tell us why we need these changes...

Example

add an example CLI or API response...

Changes

Notable changes:

• add system transaction check in collect_system_reward

Potential Impacts

• add potential impacts for other components here
• ...

[github-actions]

Valgrind Results:

==6591== Cachegrind, a cache and branch-prediction profiler
==6591== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==6591== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==6591== Command: target/release/snailtracer
==6591== 
--6591-- warning: L3 cache found, using its data for the LL simulation.
Running snailtracer example!
elapsed: 1.810981072s
==6591== 
==6591== I   refs:      427,738,261
==6591== I1  misses:          3,170
==6591== LLi misses:          2,833
==6591== I1  miss rate:        0.00%
==6591== LLi miss rate:        0.00%
==6591== 
==6591== D   refs:      204,083,477  (132,274,351 rd   + 71,809,126 wr)
==6591== D1  misses:        340,695  (    200,734 rd   +    139,961 wr)
==6591== LLd misses:        137,639  (      4,347 rd   +    133,292 wr)
==6591== D1  miss rate:         0.2% (        0.2%     +        0.2%  )
==6591== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==6591== 
==6591== LL refs:           343,865  (    203,904 rd   +    139,961 wr)
==6591== LL misses:         140,472  (      7,180 rd   +    133,292 wr)
==6591== LL miss rate:          0.0% (        0.0%     +        0.2%  )