Fix missing metadata in BibDatabaseContext

[k3KAW8Pnf7mkmdSMPHz27]

Fixes #8555 temporarily. Further investigation is needed

It inlines

jabref/src/main/java/org/jabref/logic/importer/Importer.java

Lines 103 to 108 in 75df9a3

	parserResult.setPath(filePath);
	// Make sure the mode is always set
	if (parserResult.getMetaData().getMode().isEmpty()) {
	parserResult.getMetaData().setMode(BibDatabaseModeDetection.inferMode(parserResult.getDatabase()));
	}

which were used previously.

Refs #8506

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[Siedlerchr]

Works for me!