Fix Swift path

Author: arik-so

.github/workflows/swift.yml

@@ -58,7 +58,7 @@ jobs:
             -   name: Build and test bindings
                 run: |
                     cd ci/LDKSwift
-                    LDK_C_BINDINGS_BASE="../ldk-c-bindings" RUST_BACKTRACE=1 ../swift-5.4.2-RELEASE-ubuntu20.04/usr/bin/swift test
+                    LDK_C_BINDINGS_BASE="../../ldk-c-bindings" RUST_BACKTRACE=1 ../../swift-5.4.2-RELEASE-ubuntu20.04/usr/bin/swift test
             -   name: Check that the latest headers are in the swift repo
                 run: |
                     git diff --exit-code