Remove plain text file type association from default settings

[MrSubidubi]

Closes #20291

This PR removes the plain text file association from the default settings, as #21298 added a LanguageMatcher for Plain Text files, which now associates "Plain Text" with txt-files (see

zed/crates/language/src/language.rs

Lines 127 to 137 in 10053e2

	pub static PLAIN_TEXT: LazyLock<Arc<Language>> = LazyLock::new(|| {
	Arc::new(Language::new(
	LanguageConfig {
	name: "Plain Text".into(),
	soft_wrap: Some(SoftWrap::EditorWidth),
	matcher: LanguageMatcher {
	path_suffixes: vec!["txt".to_owned()],
	first_line_pattern: None,
	},
	..Default::default()
	},

).

Thus, the association via the default settings is not required anymore, which fixes #20291 as described in #20291 (comment)

Release Notes:

• Fixed default file type associations overriding associations provided by extensions for txt-files.

[zed-industries-bot]

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📖	This PR includes links to the following GitHub Issues: #20291 If this PR aims to close an issue, please include a Closes #ISSUE line at the top of the PR body.

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