Developer mode incorrectly creates webUI.go file using backslash references on Windows

[winguru]

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Describe the bug
Enabling -dev (developer mode) on xTeVe for Windows rebuilds the src/webUI.go file with backslashes "\" in the file paths that are interpreted as escape characters instead of normal slashes "/' that should be used for file paths.

Server (please complete the following information):

• OS: Windows
• Arch: x64
• xTeVe Version and Build: 2.2.0 Build 0200

To Reproduce
Steps to reproduce the behavior:

1. Run "xteve.exe -dev" from the command line
2. Wait for xTeVe to start sucessfully
3. Examine the src/webUI.go file
4. Starting on line 7, verify that paths use the backslash ("\") character.
5. Close xTeVe and try to recompile with "go build xteve.go"
6. Verify that the compiler fails with errors in the src/webUI.go file

Expected behavior
The webUI.go file should reference paths with the slash, rather than backslash character.

Screenshots
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Desktop (please complete the following information):
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Additional context
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