yuzu/main: Resolve precedence bug within CalculateRomFSEntrySize()

Ternary operators have a lower precedence than arithmetic operators, so
what was actually occurring here is "return (out + full) ? x : y" which most
definitely isn't intended, given we calculate out recursively above. We
were essentially doing a lot of work for nothing.

src/yuzu/main.cpp

@@ -763,7 +763,7 @@ static std::size_t CalculateRomFSEntrySize(const FileSys::VirtualDir& dir, bool
         out += 1 + CalculateRomFSEntrySize(subdir, full);
     }
 
-    return out + full ? dir->GetFiles().size() : 0;
+    return out + (full ? dir->GetFiles().size() : 0);
 }
 
 static bool RomFSRawCopy(QProgressDialog& dialog, const FileSys::VirtualDir& src,