Removed quotes from d.ts

As requested in
https://github.com/borisyankov/DefinitelyTyped/pull/4658/files#r32606502

Author: Josh Goldberg

js-beautify/js-beautify.d.ts

@@ -5,25 +5,25 @@
 
 declare var js_beautify: {
     (js_source_text: string, options?: {
-        "indent_size"?: number;
-        "indent_char"?: string;
-        "eol"?: string;
-        "indent_level"?: number;
-        "indent_width_tabs"?: boolean;
-        "preserve_newlines"?: boolean;
-        "max_preserve_newlines"?: number;
-        "jslint_happy": boolean;
-        "space_after_anon_function": boolean;
-        "brace_style": string;
-        "keep_array_indentation": boolean;
-        "keep_function_indentation": boolean;
-        "space_before_conditional": boolean;
-        "break_chained_methods": boolean;
-        "eval_code": boolean;
-        "unescape_strings": boolean;
-        "wrap_line_length": number;
-        "wrap_attributes": string;
-        "wrap_attributes_indent_size": number;
-        "end_with_newline": boolean;
+        indent_size?: number;
+        indent_char?: string;
+        eol?: string;
+        indent_level?: number;
+        indent_width_tabs?: boolean;
+        preserve_newlines?: boolean;
+        max_preserve_newlines?: number;
+        jslint_happy: boolean;
+        space_after_anon_function: boolean;
+        brace_style: string;
+        keep_array_indentation: boolean;
+        keep_function_indentation: boolean;
+        space_before_conditional: boolean;
+        break_chained_methods: boolean;
+        eval_code: boolean;
+        unescape_strings: boolean;
+        wrap_line_length: number;
+        wrap_attributes: string;
+        wrap_attributes_indent_size: number;
+        end_with_newline: boolean;
     }): string;
 };