cppcheck: replace bool 0 assignment with false

[varshneydevansh]

This PR is related to the cleanup requested in commaai/panda#2105,
where the original ask is to replace bool assignments that use
integer 0/1 with false/true.

After updating panda to use cppcheck 2.21.0 and re-running the
MISRA/static-analysis path locally, the remaining cppcheck rule 10.3
finding from opendbc is in Toyota safety:

• tx = 0;

Since tx is a bool, this change replaces that assignment with:

• tx = false;

Validation:

What cppcheck report through panda before the opendbc fix:

 Devanshs-MacBook-Pro    \panda  ➜ (  new_zero_one)   30ms   1:26 AM   
 ⚡devanshvarshney ❯❯ SKIP_BUILD=1 SKIP_TABLES_DIFF=1 tests/misra/test_misra.sh 2>&1 | rg "misra-c2012-10.3"

/Users/devanshvarshney/panda/.venv/lib/python3.12/site-packages/opendbc/safety/modes/toyota.h:334:10: style: misra violation (use --rule-texts=<file> to get proper output) [misra-c2012-10.3]
/Users/devanshvarshney/panda/board/drivers/can_common.h:41:12: style: misra violation (use --rule-texts=<file> to get proper output) [misra-c2012-10.3]
/Users/devanshvarshney/panda/board/drivers/can_common.h:51:9: style: misra violation (use --rule-texts=<file> to get proper output) [misra-c2012-10.3]

After the fix:

 Devanshs-MacBook-Pro    \panda  ➜ (  new_zero_one)   60ms   1:48 AM   
 ⚡devanshvarshney ❯❯ SKIP_BUILD=1 SKIP_TABLES_DIFF=1 tests/misra/test_misra.sh 2>&1 | rg "misra-c2012-10.3"

# no output

Where this was found:

• cppcheck: catch ints as bools panda#2105
• cppcheck: catch ints as bools panda#2105 (comment)

Related:

• Fix #14607: MISRA: make rule 10.3 warn on bool <- 0/1 in C99 and later cppcheck-opensource/cppcheck#8340
• Fix #14628: MISRA: avoid false positives for true/false after #14607 cppcheck-opensource/cppcheck#8388
• https://github.com/cppcheck-opensource/cppcheck/releases/tag/2.21.0

[github-actions]

Car behavior report

Replays driving segments through this PR and compares the behavior to master.
Please review any changes carefully to ensure they are expected.

Testing 190 segments for: TOYOTA_ALPHARD_TSS2, TOYOTA_AVALON, TOYOTA_AVALON_2019, TOYOTA_AVALON_TSS2, TOYOTA_CAMRY, TOYOTA_CAMRY_TSS2, TOYOTA_CHR, TOYOTA_CHR_TSS2, TOYOTA_COROLLA, TOYOTA_COROLLA_TSS2, TOYOTA_HIGHLANDER, TOYOTA_HIGHLANDER_TSS2, TOYOTA_PRIUS, TOYOTA_PRIUS_V, TOYOTA_PRIUS_TSS2, TOYOTA_RAV4, TOYOTA_RAV4H, TOYOTA_RAV4_TSS2, TOYOTA_RAV4_TSS2_2022, TOYOTA_RAV4_TSS2_2023, TOYOTA_RAV4_PRIME, TOYOTA_YARIS, TOYOTA_MIRAI, TOYOTA_SIENNA, TOYOTA_SIENNA_4TH_GEN

✅ 0 changed, 190 passed, 0 errors