Fix multi line field comments in SQL export.

[nktfh100]

Currently field comments with multiple lines are exported like this:

CREATE TABLE "User" (
	"id" INTEGER NOT NULL UNIQUE,
	-- line1
line2
line3
	"name" VARCHAR,
	PRIMARY KEY("id")
);

This PR fixes it so that multiple-line comments export correctly:

CREATE TABLE "User" (
	"id" INTEGER NOT NULL UNIQUE,
	-- line1
	-- line2
	-- line3
	"name" VARCHAR,
	PRIMARY KEY("id")
);

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Name	Status	Preview	Comments	Updated (UTC)
drawdb	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 4, 2024 9:27am

[1ilit]

Thanks!