Remove broken redundant backtrace hint
When the compiler driver panics it attempts to show a hint about using `RUST_BACKTRACE`. However, the logic is currently reversed to the hint is only shown if `RUST_BACKTRACE` is *already* set: ```shell > RUST_BACKTRACE=1 rustc /dev/null --crate-type proc-macro error: internal compiler error: unexpected panic ... note: run with `RUST_BACKTRACE=1` for a backtrace thread 'rustc' panicked at 'attempt to subtract with overflow', librustc_errors/emitter.rs:287:49 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. > RUST_BACKTRACE=0 rustc /dev/null --crate-type proc-macro error: internal compiler error: unexpected panic ... thread 'rustc' panicked at 'attempt to subtract with overflow', librustc_errors/emitter.rs:287:49 note: Run with `RUST_BACKTRACE=1` for a backtrace. ``` As the `panic` itself already has a working `RUST_BACKTRACE` hint just remove the broken duplicate hint entirely.
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