Fix invalid indent rule when using tabs (#720)

Author: kuzivany

src/rules/converters/indent.ts

@@ -4,7 +4,7 @@ export const convertIndent: RuleConverter = (tslintRule) => {
     let indentSize: number | string = 4; // @typescript-eslint/indent default
 
     if (tslintRule.ruleArguments[0] === "tabs") {
-        indentSize = "tabs";
+        indentSize = "tab";
     } else if (tslintRule.ruleArguments[1] === 2) {
         indentSize = 2;
     }

src/rules/converters/tests/indent.test.ts

@@ -53,7 +53,7 @@ describe(convertIndent, () => {
             rules: [
                 {
                     ruleName: "@typescript-eslint/indent",
-                    ruleArguments: ["tabs"],
+                    ruleArguments: ["tab"],
                 },
             ],
         });