fix(tests): match generated formatting

Author: matoous

src/test/java/com/sumup/sdk/core/ApiClientTest.java

@@ -93,7 +93,8 @@ void defaultRuntimeHeadersAreIncluded() {
     assertEquals("java", headers.firstValue("X-Sumup-Runtime").orElse(null));
     assertEquals(
         Runtime.version().toString(), headers.firstValue("X-Sumup-Runtime-Version").orElse(null));
-    assertEquals("application/problem+json, application/json", headers.firstValue("Accept").orElse(null));
+    assertEquals(
+        "application/problem+json, application/json", headers.firstValue("Accept").orElse(null));
   }
 
   @Test