Fix "unnecessary braces" warning

Original warning:
```
warning: unnecessary braces around block return value
 --> src/filter/size.rs:5:39
  |
5 |     static ref SIZE_CAPTURES: Regex = { Regex::new(r"(?i)^([+-])(\d+)(b|[kmgt]i?b?)$").unwrap() };
  |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
  |
  = note: `#[warn(unused_braces)]` on by default

warning: 1 warning emitted
```

src/filter/size.rs

@@ -2,7 +2,7 @@ use lazy_static::lazy_static;
 use regex::Regex;
 
 lazy_static! {
-    static ref SIZE_CAPTURES: Regex = { Regex::new(r"(?i)^([+-])(\d+)(b|[kmgt]i?b?)$").unwrap() };
+    static ref SIZE_CAPTURES: Regex = Regex::new(r"(?i)^([+-])(\d+)(b|[kmgt]i?b?)$").unwrap();
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]