indentation is broken for `@GetMapping` snippet completion

[martinlippert]

the indentation is broken when inserting a @GetMapping snippet completion. Results look like this:

	<*>@GetMapping("path")
public SomeData getMethodName(@RequestParam String param) {
	return new SomeData();
}

(where the <*> marks the position of the cursor when invoking the code completion)

[martinlippert]

Fixed with ae68b8e. Due to the new InsertTextMode that we set to As-Is, we don't need to deal with magic client-side indentation anymore and need to remove that logic.

Additional code cleanup work is needed for the next cycle: #1154