Make mount_point argument positional in examples/simple.rs

[numbleroot]

Simple change to fix the TODO stated for CLI argument mount_point in examples/simple.rs: To make the argument positional, as is the case for the other examples. This is achieved simply by removing the #[clap(long, default_value = "")] line right above mount_point, as fields without attributes define positional arguments by default. And by adjusting the tests that use the simple example.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve --mount-point compatibility for simple example

Making mount_point positional here removes the --mount-point flag that existing repo tooling still uses, so those invocations now fail argument parsing before mount starts (for example fuser-tests/src/commands/simple.rs:31-37, fuser-tests/src/commands/mount.rs:247, fuser-tests/src/experimental.rs:161, and tests/bsd_pjdfs.sh:21 all pass --mount-point). This commit therefore breaks the current test/scripts workflow unless all callers are updated in lockstep or a compatibility alias is kept.

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