Prompt suffix inconsistency

[sebbarg]

Information

• OS: MacOS
• Version: 0.49.1 (and later)
• Terminal: iTerm2

Describe the bug
Prompt suffix (':' colon) is missing in some cases.

Simple prompt without default value. Notice the missing colon:

AnsiConsole.Prompt(
  new TextPrompt<string>("no default, no suffix"));

// => no default, no suffix

Simple prompt with default value. Notice the colon is present:

AnsiConsole.Prompt(
  new TextPrompt<string>("with default, with suffix").DefaultValue("default"));

// => with default, with suffix (default):

Expected behavior
Be consistent :)

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