Remove @SuppressWarnings annotation no longer raised by ecj

Due to eclipse-jdt/eclipse.jdt.core#4293 ecj
no longer warnigs about using a method inherited from a deprecated type

Author: stephan-herrmann

org.eclipse.jdt.debug/model/org/eclipse/jdt/internal/debug/core/model/JDIStackFrame.java

@@ -1571,7 +1571,6 @@ public boolean canStepWithFilters() {
 	/**
 	 * @see org.eclipse.debug.core.model.IFilteredStep#stepWithFilters()
 	 */
-	@SuppressWarnings("deprecation")
 	@Override
 	public void stepWithFilters() throws DebugException {
 		((IJavaThread) getThread()).stepWithFilters();