🎨 Improving structure / format of the code. 优化代码，批量删除无用 import

pigx-auth/src/main/java/com/pig4cloud/pigx/auth/support/password/OAuth2ResourceOwnerPasswordAuthenticationConverter.java

@@ -2,7 +2,6 @@ package com.pig4cloud.pigx.auth.support.password;
 
 import com.pig4cloud.pigx.auth.support.base.OAuth2ResourceOwnerBaseAuthenticationConverter;
 import com.pig4cloud.pigx.common.security.util.OAuth2EndpointUtils;
-import javax.servlet.http.HttpServletRequest;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
@@ -10,6 +9,7 @@ import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
 
+import javax.servlet.http.HttpServletRequest;
 import java.util.Map;
 import java.util.Set;