filesystem/deletePath: remove unnecessary quotes from error message

Paths are already quoted:

error:
       … while fetching the input 'path:/nix/store/rs2s2ca7xs87v82aps54m1p3sqrfz6c8-source'

       error: chmod '"/nix/store/rs2s2ca7xs87v82aps54m1p3sqrfz6c8-source"': Read-only file system

src/libutil/file-system.cc

@@ -416,7 +416,7 @@ static void _deletePath(Descriptor parentfd, const fs::path & path, uint64_t & b
         const auto PERM_MASK = S_IRUSR | S_IWUSR | S_IXUSR;
         if ((st.st_mode & PERM_MASK) != PERM_MASK) {
             if (fchmodat(parentfd, name.c_str(), st.st_mode | PERM_MASK, 0) == -1)
-                throw SysError("chmod '%1%'", path);
+                throw SysError("chmod %1%", path);
         }
 
         int fd = openat(parentfd, path.c_str(), O_RDONLY);