fix a typo in the packaging batch file

the soft_oal.dll was written with a dash which is clearly wrong

Author: Bigpet

package.bat

@@ -1,7 +1,7 @@
 mkdir build
 mkdir build\rpcs3
 copy bin\rpcs3-*.exe build\rpcs3
-copy bin\soft-oal.dll build\rpcs3
+copy bin\soft_oal.dll build\rpcs3
 copy bin\make_fself.cmd build\rpcs3
 
 mkdir build\rpcs3\dev_hdd1