bricks/stm32: Revert "Force exit on IDE stop button."

This reverts commit 7e9951d.

This caused existing user programs that expected finally clauses to run
on exit to break.

Fixes: pybricks/support#834

CHANGELOG.md

@@ -9,10 +9,13 @@
 - Fixed crash on calling methods on uninitialized objects ([support#805]).
 - Fixed crash on calling methods in `__init__(self, ...)` before
   calling `super().__init(...)` on uninitialized objects ([support#777]).
+- Reverted Pybricks Code stop button raises `SystemAbort` instead of
+  `SystemExit` ([support#834]).
 
 [support#777]: https://github.com/pybricks/support/issues/777
 [support#805]: https://github.com/pybricks/support/issues/805
 [support#826]: https://github.com/pybricks/support/issues/826
+[support#834]: https://github.com/pybricks/support/issues/834
 
 
 ## [3.2.0b6] - 2022-12-02

lib/pbio/sys/command.c

@@ -23,7 +23,7 @@ pbio_pybricks_error_t pbsys_command(const uint8_t *data, uint32_t size) {
 
     switch (cmd) {
         case PBIO_PYBRICKS_COMMAND_STOP_USER_PROGRAM:
-            pbsys_program_stop(true);
+            pbsys_program_stop(false);
             return PBIO_PYBRICKS_ERROR_OK;
         case PBIO_PYBRICKS_COMMAND_START_USER_PROGRAM:
             return pbio_pybricks_error_from_pbio_error(pbsys_program_load_start_user_program());