Fix missing file handle close if createWriteStream throws

Current versions of Node.js will actually close the file descriptor
once the file handle object gets GC'd, though this is deprecated
and ought not be relied on.

Author: GarboMuffin

src-main/atomic-write-stream.js

@@ -142,6 +142,9 @@ const createAtomicWriteStream = async (path) => {
       highWaterMark: 1024 * 1024 * 5
     });
   } catch (err) {
+    if (fileHandle) {
+      fileHandle.close();
+    }
     releaseFileLock();
     throw err;
   }