fix: download diff before running scan

Signed-off-by: Mykola Rudyk <m.rudyk@samsung.com>

src/main/java/com/lpvs/service/LPVSDetectService.java

@@ -126,7 +126,7 @@ public void runOneScan() {
 
                 List<LPVSFile> scanResult =
                         this.runScan(
-                                webhookConfig, LPVSFileUtil.getPathByPullRequest(webhookConfig));
+                                webhookConfig, gitHubService.getPullRequestFiles(webhookConfig));
 
                 List<LPVSLicenseService.Conflict<String, String>> detectedConflicts =
                         licenseService.findConflicts(webhookConfig, scanResult);