start browser discovery code for Windows

src/java/net/i2p/i2pfirefox/I2PGenericUnsafeBrowser.java

@@ -64,7 +64,7 @@ public class I2PGenericUnsafeBrowser {
                     {
                         // Scanner is no longer needed if match is found, so close it
                         kb.close();
-                        String defaultBrowser = matcher.toString();
+                        String defaultBrowser = matcher.group(1);
                         //group(1);
                         // Capitalize first letter and return String
                         //defaultBrowser = defaultBrowser.substring(0, 1).toUpperCase() + defaultBrowser.substring(1, defaultBrowser.length());