Dub file with BetterC configured does not properly generate a VisualD project file.

[MrZoraman]

System information

• dub version: DUB version 1.23.0, built on Sep 22 2020
• OS Platform and distribution: Windows 10 Pro (2004)
• compiler version DMD32 D Compiler v2.094.0-dirty

Bug Description

Generating a VisualD project with BetterC does not set the BetterC flag in the produced .visualproj file.

How to reproduce?

{
    "authors": [
	    "MrZoraman"
    ],
    "copyright": "Copyright © 2020, MrZoraman",
    "description": "A minimal D application.",
    "license": "proprietary",
    "name": "vdtest",
    "buildOptions": [
	    "betterC"
    ]
}

Calling dub generate visuald produces vdtest.visualproj with the following flag set to false: <betterC>0</betterC> (or missing alltogether).

Expected Behavior

In the .visualproj file, <betterC>1</betterC> should be set.