Fix wrong case in filename

jplag.frontend.rust/src/test/java/de/jplag/rust/RustFrontendTest.java

@@ -34,7 +34,7 @@ public class RustFrontendTest {
     /**
      * Test source file that is supposed to produce a complete set of tokens, i.e. all types of tokens.
      */
-    private static final String COMPLETE_TEST_FILE = "Complete.rs";
+    private static final String COMPLETE_TEST_FILE = "complete.rs";
     public static final int NOT_SET = -1;
     private static final String RUST_SHEBANG = "#!.*$";
     private static final double EPSILON = 1E-6;