[blame] Reset rename detector before computing renames.

Bug: 354507
Change-Id: I5e9c65a082d9dee1e87536c5cf2a8de75efa6a33
Signed-off-by: Kevin Sawicki <kevin@github.com>

org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java

 
 		treeWalk.setFilter(TreeFilter.ANY_DIFF);
 		treeWalk.reset(parent.getTree(), commit.getTree());
+		renameDetector.reset();
 		renameDetector.addAll(DiffEntry.scan(treeWalk));
 		for (DiffEntry ent : renameDetector.compute()) {
 			if (isRename(ent) && ent.getNewPath().equals(path.getPath()))