Rust: Fix bad join

```
Evaluated relational algebra for predicate _PathResolution::CrateItemNode.getName/0#dispred#91b4dd6b_PathResolution::SourceFileItemNode#bd8f490__#antijoin_rhs@e84aee8k with tuple counts:
        35406180  ~0%    {3} r1 = JOIN PathResolution::SourceFileItemNode#bd8f4905 WITH `PathResolution::CrateItemNode.getName/0#dispred#91b4dd6b` CARTESIAN PRODUCT OUTPUT Lhs.0, Rhs.1, Rhs.0
            8455  ~2%    {4}    | JOIN WITH `PathResolution::declaresDirectly/3#7d0350fb_021#join_rhs` ON FIRST 2 OUTPUT Rhs.2, Lhs.0, Lhs.2, Lhs.1
            3259  ~0%    {3}    | JOIN WITH num#PathResolution::TTypeNamespace#4897e416 ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Lhs.3
                         return r1
```

Author: hvitved

rust/ql/lib/codeql/rust/internal/PathResolution.qll

@@ -1321,6 +1321,12 @@ private predicate crateDependency(SourceFileItemNode file, string name, CrateIte
   exists(CrateItemNode c | dep = c.(Crate).getDependency(name) | file = c.getASourceFile())
 }
 
+pragma[nomagic]
+private predicate hasDeclOrDep(SourceFileItemNode file, string name) {
+  declaresDirectly(file, TTypeNamespace(), name) or
+  crateDependency(file, name, _)
+}
+
 /**
  * Holds if `file` depends on crate `dep` named `name`.
  */
@@ -1334,8 +1340,7 @@ private predicate crateDependencyEdge(SourceFileItemNode file, string name, Crat
   // a given file to its crate (for example, if the file is `mod` imported inside a macro that the
   // extractor is unable to expand).
   name = dep.getName() and
-  not declaresDirectly(file, TTypeNamespace(), name) and
-  not crateDependency(file, name, _)
+  not hasDeclOrDep(file, name)
 }
 
 private predicate useTreeDeclares(UseTree tree, string name) {