changed var to let in last files (#13087)

public/app/core/specs/datemath.test.ts

@@ -55,8 +55,8 @@ describe('DateMath', () => {
   });
 
   describe('subtraction', () => {
-    var now;
-    var anchored;
+    let now;
+    let anchored;
 
     beforeEach(() => {
       clock = sinon.useFakeTimers(unix);
@@ -83,7 +83,7 @@ describe('DateMath', () => {
   });
 
   describe('rounding', () => {
-    var now;
+    let now;
 
     beforeEach(() => {
       clock = sinon.useFakeTimers(unix);

public/app/core/specs/table_model.test.ts

@@ -26,7 +26,7 @@ describe('when sorting table desc', () => {
 });
 
 describe('when sorting table asc', () => {
-  var table;
+  let table;
   const panel = {
     sort: { col: 1, desc: false },
   };
@@ -46,8 +46,8 @@ describe('when sorting table asc', () => {
 });
 
 describe('when sorting with nulls', () => {
-  var table;
-  var values;
+  let table;
+  let values;
 
   beforeEach(() => {
     table = new TableModel();

public/app/core/specs/time_series.test.ts

@@ -174,7 +174,7 @@ describe('TimeSeries', function() {
   });
 
   describe('can detect if series contains ms precision', function() {
-    var fakedata;
+    let fakedata;
 
     beforeEach(function() {
       fakedata = testData;
@@ -194,7 +194,7 @@ describe('TimeSeries', function() {
   });
 
   describe('series overrides', function() {
-    var series;
+    let series;
     beforeEach(function() {
       series = new TimeSeries(testData);
     });
@@ -313,7 +313,7 @@ describe('TimeSeries', function() {
   });
 
   describe('value formatter', function() {
-    var series;
+    let series;
     beforeEach(function() {
       series = new TimeSeries(testData);
     });