gyp: update invalid escape sequence for Windows VCLinkerTool settings

Author: Totto16

binding.gyp

@@ -79,7 +79,7 @@
                 },
                 "VCLinkerTool": {
                     "AdditionalDependencies": [
-                        "<!@(pkg-config oopetris-recordings --libs-only-l | sed s/-l/lib/g |sed 's/\s/.a /g')",  # adjust to the default setting, namely lib<name>.a via some sed magic
+                        "<!@(pkg-config oopetris-recordings --libs-only-l | sed s/-l/lib/g |sed 's/\\s/.a /g')",  # adjust to the default setting, namely lib<name>.a via some sed magic
                     ],
                 },
             },