Fix drag-and-drop file uploading

src/main/java/dan200/computercraft/client/gui/ComputerScreenBase.java

@@ -117,8 +117,6 @@ public abstract class ComputerScreenBase<T extends ContainerComputerBase> extend
     @Override
     public void filesDragged( @Nonnull List<Path> files )
     {
-        // TODO: this thing doesn't work in Tweaked at this moment
-        if ( true ) return;
         if( files.isEmpty() ) return;
 
         if( computer == null || !computer.isOn() )

src/main/java/dan200/computercraft/shared/computer/inventory/ContainerComputerBase.java

@@ -213,6 +213,7 @@ public abstract class ContainerComputerBase extends ScreenHandler implements ICo
             {
                 try( FileSystemWrapper<WritableByteChannel> channel = fs.openForWrite( file.getName(), false, Function.identity() ) )
                 {
+                    file.getBytes().rewind();
                     channel.get().write( file.getBytes() );
                 }
             }