Make fix requested by review (but forgot to do it before merging)

Author: dpvc

ts/input/tex/base/BaseMethods.ts

@@ -1965,12 +1965,8 @@ const BaseMethods: { [key: string]: ParseMethod } = {
       // @test Subarray, Small Matrix
       array.arraydef['displaystyle'] = false;
     }
-    if (style === 'S') {
-      // @test Subarray, Small Matrix
-      array.arraydef['scriptlevel'] = 1;
-    } else {
-      array.arraydef['scriptlevel'] = 0;
-    }
+    // @test Subarray, Small Matrix
+    array.arraydef['scriptlevel'] = style === 'S' ? 1 : 0;
     if (raggedHeight) {
       // @test Subarray, Small Matrix
       array.arraydef['useHeight'] = false;