fix fix typo in isTableLayoutFixed and no-unused-vars

Author: afc163

src/Table.tsx

@@ -25,7 +25,6 @@ import {
   DefaultValueType,
   ScrollPosition,
   Expander,
-  Key,
 } from './interface';
 
 export interface TableProps<ValueType>
@@ -295,7 +294,7 @@ class Table<ValueType> extends React.Component<TableProps<ValueType>, TableState
     // if scroll.x is number/px/% width value, we should fixed table layout
     // to avoid long word layout broken issue
     if (scroll.x && scroll.x !== true && scroll.x !== 'max-content') {
-      return false;
+      return true;
     }
     return false;
   }

tests/__snapshots__/Table.fixedColumns.spec.js.snap

@@ -2,7 +2,7 @@
 
 exports[`Table.fixedColumns renders correctly 1`] = `
 <div
-  class="rc-table rc-table-scroll-position-left"
+  class="rc-table rc-table-scroll-position-left rc-table-layout-fixed"
 >
   <div
     class="rc-table-content"

tests/__snapshots__/Table.spec.js.snap

@@ -1801,7 +1801,7 @@ exports[`Table rowKey renders tableLayout 1`] = `
 
 exports[`Table scroll renders scroll.x is a number 1`] = `
 <div
-  class="rc-table rc-table-scroll-position-left"
+  class="rc-table rc-table-scroll-position-left rc-table-layout-fixed"
 >
   <div
     class="rc-table-content"