Fix string literals escaping logic

[terriblegoodday]

The stringLiteralWithQuotes had some leftover Kotlin string escaping logic that had to be cleaned up:

1. Dollar sign escaping: in Swift, the dollar sign should not be escaped as $ → ${'$'} – this
   breaks emitting the intended string literal.
2. .trimMargin doesn’t exist for Swift multiline strings, so the code would fail to compile if
   we attempted something like that.
3. Multiline literals in Swift should be formatted as:

"""
abc();
def();
"""

Not

"""
|abc();
|def();
""".trimMargin()

---

Before:

€\t@\t${'$'} -> "€\\t@\\t${'$'}{'${'$'}'}"

"\"ab$c();\\ndef();\"" -> "\"ab${'$'}c();\\ndef();\""

"abc();\ndef();" -> """
|abc();
|def();
""".trimMargin()

After:

€\t@\t${'$'} -> "€\\t@\\t${'$'}"

"\"ab$c();\\ndef();\"" -> "\"ab$c();\\ndef();\""

"abc();\ndef();" -> """
abc();
def();
"""

[terriblegoodday]

Force pushed fixed indent for stringLiteralWithQuotes, ./gradlew check should pass now.

[kdubb]

@terriblegoodday Thank you... I was trying to use GitHub's web interface to "quickly" fix them last night haha