Fix more error tests

Author: Voultapher

src/tools/miri/tests/fail/dangling_pointers/dangling_primitive.stderr

@@ -17,7 +17,7 @@ help: ALLOC was deallocated here:
 LL |     };
    |     ^
    = note: BACKTRACE (of the first span):
-   = note: inside `main` at RUSTLIB/std/src/macros.rs:LL:CC
+   = note: inside `main` at RUSTLIB/std/src/std_macros.rs:LL:CC
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr

@@ -12,7 +12,7 @@ LL |     dbg!(x.0);
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/std/src/macros.rs:LL:CC
+   = note: inside `main` at RUSTLIB/std/src/std_macros.rs:LL:CC
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace