[lldb/Commands] Fix short option collision for process launch
This patch changes the short option used in CommandOptionsProcessLaunch
for the -v|--environment command option to -E|--environment.
The reason for that is, that it collides with the -v|--structured-data-value
command option generated by OptionGroupPythonClassWithDict that
I'm using in an upcoming patch for the process launch command.
The long option --environment remains the same.
Differential Review: https://reviews.llvm.org/D95100
Signed-off-by: Med Ismail Bennani <email@example.com>