Fix compile error: Rename duplicate 'children' variable to 'currentChildren'

The variable 'children' was declared twice in the processDynamicElements method:
- Once at the method start (line 126)
- Again inside the loop (line 157)

This caused a compilation error. Renamed the second occurrence to
'currentChildren' to avoid the conflict.

Author: claude

bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/MenuManagerShowProcessor.java

@@ -154,9 +154,9 @@ private void processDynamicElements(MMenu menuModel, MenuManager menuManager) {
 				if (mel.size() > 0) {
 
 					int position = 0;
-					List<MMenuElement> children = menuModel.getChildren();
-					while (position < children.size()) {
-						if (currentMenuElement == children.get(position)) {
+					List<MMenuElement> currentChildren = menuModel.getChildren();
+					while (position < currentChildren.size()) {
+						if (currentMenuElement == currentChildren.get(position)) {
 							position++;
 							break;
 						}