fix: correct import formatting in mustache templates and TypeScript files

Author: GregoryMerlet

modules/openapi-generator/src/main/resources/typescript-fetch/modelOneOf.mustache

@@ -1,12 +1,12 @@
 {{#hasImports}}
 {{#oneOfArrays}}
-    import type { {{{.}}} } from './{{.}}{{importFileExtension}}';
-    import {
+import type { {{{.}}} } from './{{.}}{{importFileExtension}}';
+import {
     instanceOf{{{.}}},
     {{{.}}}FromJSON,
     {{{.}}}FromJSONTyped,
     {{{.}}}ToJSON,
-    } from './{{.}}{{importFileExtension}}';
+} from './{{.}}{{importFileExtension}}';
 {{/oneOfArrays}}
 {{#oneOfModels}}
 import type { {{{.}}} } from './{{.}}{{importFileExtension}}';

samples/client/petstore/typescript-fetch/builds/oneOf/models/TestArrayResponse.ts

@@ -12,20 +12,20 @@
  * Do not edit the class manually.
  */
 
-    import type { TestA } from './TestA';
-    import {
+import type { TestA } from './TestA';
+import {
     instanceOfTestA,
     TestAFromJSON,
     TestAFromJSONTyped,
     TestAToJSON,
-    } from './TestA';
-    import type { TestB } from './TestB';
-    import {
+} from './TestA';
+import type { TestB } from './TestB';
+import {
     instanceOfTestB,
     TestBFromJSON,
     TestBFromJSONTyped,
     TestBToJSON,
-    } from './TestB';
+} from './TestB';
 
 /**
  * @type TestArrayResponse