Remove `:` from `stack-protector-heuristics-effect.rs` Filecheck Pattern
With function sections, the assembly label does not necessarily end in `:`.
Remove trailing `:` to be more consistent with the rest of the existing Filecheck patterns.
```
// CHECK-LABEL: local_string_addr_taken
#[no_mangle]
pub fn local_string_addr_taken(f: fn(&String)) {
let x = String::new();
f(&x);
```
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| .. | ||
| stack-protector-heuristics-effect-windows-32bit.rs | ||
| stack-protector-heuristics-effect-windows-64bit.rs | ||
| stack-protector-heuristics-effect.rs | ||
| stack-protector-target-support.rs | ||