Valgrind: Adjust statx suppressions

We have 2 new variations on the statx false positive,
this time from calls from the Rust code.
I'm removing the mangled symbol to simplify the rule and accomodate
future variations.

unit_tests/valgrind.supp

@@ -320,7 +320,6 @@
    statx(file_name)
    fun:statx
    fun:statx
-   fun:_ZN3std3sys4unix2fs9try_statx*
    ...
 }
 {
@@ -338,7 +337,6 @@
    statx(file_name)
    fun:syscall
    fun:statx
-   fun:_ZN3std3sys4unix2fs9try_statx*
    ...
 }
 {
@@ -347,7 +345,6 @@
    statx(buf)
    fun:syscall
    fun:statx
-   fun:_ZN3std3sys4unix2fs9try_statx*
    ...
 }
 {