[librsvg/fix-cargo-test-cmdline] tests: Fix 'cargo test cmdline' after the crates merge

[Sven Neumann <sneumann src gnome org>]

commit afa7bdd86bb1a9dd916a0d6e27764d6904f3b4a1
Author: Sven Neumann <sven svenfoo org>
Date:   Mon Nov 2 22:01:31 2020 +0100

    tests: Fix 'cargo test cmdline' after the crates merge

 tests/src/cmdline/rsvg_convert.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/src/cmdline/rsvg_convert.rs b/tests/src/cmdline/rsvg_convert.rs
index b4d82769..24325f91 100644
--- a/tests/src/cmdline/rsvg_convert.rs
+++ b/tests/src/cmdline/rsvg_convert.rs
@@ -35,7 +35,7 @@ impl RsvgConvert {
     fn binary_location() -> &'static Path {
         match option_env!("LIBRSVG_BUILD_DIR") {
             Some(dir) => Path::new(dir),
-            None => Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap(),
+            None => Path::new(env!("CARGO_MANIFEST_DIR")),
         }
     }