refactoring: removed magic numbers

fh.fd.ci.client/src/test/java/de/fd/fh/FigureBishopTest.java

@@ -23,7 +23,10 @@ class FigureBishopTest
     {
         Figure f = new FigureBishop();
 
-        assertFalse(f.moveAllowed(45, 46,
-                new Figure[64]));
+        int src = Figure.fieldLength * 5 + 5;
+        int dst = src + 1;
+
+        assertFalse(f.moveAllowed(src, dst,
+                new Figure[Figure.fieldLength * Figure.fieldLength]));
     }
 }