Nit pick: replace if statements with switch

These conditions will increase, to keep the code cleaner replace 3
if statements with a switch

src/applications/maniphest/editor/ManiphestTransactionEditor.php

@@ -448,32 +448,34 @@ final class ManiphestTransactionEditor
         break;
 
         case PhabricatorTransactions::TYPE_CUSTOMFIELD:
-        if ($xaction->getMetadataValue('customfield:key') == 'std:maniphest:purchasing:approver') {
-          foreach ($xaction->getRequiredHandlePHIDs() as $p) {
-            if (!empty($p)) {
-              $approver = $p;
+          switch ($xaction->getMetadataValue('customfield:key')) {
+            case 'std:maniphest:purchasing:approver':
+              foreach ($xaction->getRequiredHandlePHIDs() as $p) {
+                if (!empty($p)) {
+                  $approver = $p;
+                  break;
+                }
+              }
               break;
-            }
-          }
-        }
 
-        if ($xaction->getMetadataValue('customfield:key') == 'std:maniphest:purchasing:project') {
-          foreach ($xaction->getRequiredHandlePHIDs() as $p) {
-            if (!empty($p)) {
-              $purchasing_project = $p;
+            case 'std:maniphest:purchasing:project':
+              foreach ($xaction->getRequiredHandlePHIDs() as $p) {
+                if (!empty($p)) {
+                  $purchasing_project = $p;
+                  break;
+                }
+              }
               break;
-            }
-          }
-        }
 
-        if ($xaction->getMetadataValue('customfield:key') == 'std:maniphest:sysadmin:confidential-request') {
-          if ($xaction->getNewValue() != $xaction->getOldValue()) {
-            $changed_confidentiality = true;
-          }
-          if ($xaction->getNewValue() == 'Yes' || $xaction->getNewValue() == 'Dunno') {
-            $confidential = true;
+            case 'std:maniphest:sysadmin:confidential-request':
+              if ($xaction->getNewValue() != $xaction->getOldValue()) {
+                $changed_confidentiality = true;
+              }
+              if ($xaction->getNewValue() == 'Yes' || $xaction->getNewValue() == 'Dunno') {
+                $confidential = true;
+              }
+              break;
           }
-        }
 
         break;
       }