Fix LocalStorage->unlink to work on folder as expected

lib/private/files/storage/local.php

@@ -164,7 +164,14 @@ if (\OC_Util::runningOnWindows()) {
 		}
 
 		public function unlink($path) {
-			return unlink($this->datadir . $path);
+			if ($this->is_dir($path)) {
+				return $this->rmdir($path);
+			} else if ($this->is_file($path)) {
+				return unlink($this->datadir . $path);
+			} else {
+				return false;
+			}
+
 		}
 
 		public function rename($path1, $path2) {

lib/private/files/view.php

@@ -432,7 +432,7 @@ class View {
 					if ($this->is_dir($path1)) {
 						$result = $this->copy($path1, $path2);
 						if ($result === true) {
-							$result = $storage1->unlink($internalPath1);
+							$result = $storage1->rmdir($internalPath1);
 						}
 					} else {
 						$source = $this->fopen($path1 . $postFix1, 'r');