Use consistent ternary expression style

Update all ternary expressions so that the condition is always in
parentheses and "not equals" is used in the test. This helps to bring
consistency across the codebase which makes ternary expression easier
to scan.

For example: `a = (a != null) ? a : b`

Issue gh-8945

test/src/main/java/org/springframework/security/test/context/support/WithSecurityContextTestExecutionListener.java

@@ -100,8 +100,8 @@ public class WithSecurityContextTestExecutionListener extends AbstractTestExecut
 	private TestSecurityContext createTestSecurityContext(Class<?> annotated, TestContext context) {
 		MetaAnnotationUtils.AnnotationDescriptor<WithSecurityContext> withSecurityContextDescriptor = MetaAnnotationUtils
 				.findAnnotationDescriptor(annotated, WithSecurityContext.class);
-		WithSecurityContext withSecurityContext = withSecurityContextDescriptor == null ? null
-				: withSecurityContextDescriptor.getAnnotation();
+		WithSecurityContext withSecurityContext = (withSecurityContextDescriptor != null)
+				? withSecurityContextDescriptor.getAnnotation() : null;
 		return createTestSecurityContext(annotated, withSecurityContext, context);
 	}
 

test/src/main/java/org/springframework/security/test/web/servlet/request/SecurityMockMvcRequestPostProcessors.java

@@ -770,7 +770,7 @@ public final class SecurityMockMvcRequestPostProcessors {
 				// remember the SecurityContextRepository is used in many different
 				// locations
 				SecurityContext delegateResult = this.delegate.loadContext(requestResponseHolder);
-				return result == null ? delegateResult : result;
+				return (result != null) ? result : delegateResult;
 			}
 
 			@Override

test/src/test/java/org/springframework/security/test/web/servlet/request/SecurityMockMvcRequestPostProcessorsDigestTests.java

@@ -120,8 +120,8 @@ public class SecurityMockMvcRequestPostProcessorsDigestTests {
 			@Override
 			public void doFilter(ServletRequest request, ServletResponse response) {
 				Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
-				SecurityMockMvcRequestPostProcessorsDigestTests.this.username = authentication == null ? null
-						: authentication.getName();
+				SecurityMockMvcRequestPostProcessorsDigestTests.this.username = (authentication != null)
+						? authentication.getName() : null;
 			}
 		});
 		return this.username;