coverage: Format all remaining tests

These tests can simply be reformatted as normal, because the resulting changes
are unimportant.

tests/coverage/thin-lto.coverage

@@ -1,5 +1,4 @@
    LL|       |// compile-flags: -O -C lto=thin -C prefer-dynamic=no
    LL|       |
-   LL|      1|pub fn main() {
-   LL|      1|}
+   LL|      1|pub fn main() {}