fix: small fixes

src/views/charts/CChartBarExample.vue

@@ -6,7 +6,6 @@
 </template>
 
 <script>
-import { customTooltips } from '@coreui/coreui-plugin-chartjs-custom-tooltips'
 import { CChartBar } from '@coreui/coreui-vue-chartjs'
 
 export default {

src/views/charts/CChartLineExample.vue

@@ -6,7 +6,6 @@
 </template>
 
 <script>
-import { customTooltips } from '@coreui/coreui-plugin-chartjs-custom-tooltips'
 import { CChartLine } from '@coreui/coreui-vue-chartjs'
 
 export default {

src/views/charts/CChartPolarAreaExample.vue

@@ -10,7 +10,6 @@
 </template>
 
 <script>
-import { customTooltips } from '@coreui/coreui-plugin-chartjs-custom-tooltips'
 import { CChartPolarArea } from '@coreui/coreui-vue-chartjs'
 
 export default {

src/views/charts/CChartRadarExample.vue

@@ -10,7 +10,6 @@
 </template>
 
 <script>
-import { customTooltips } from '@coreui/coreui-plugin-chartjs-custom-tooltips'
 import { CChartRadar } from '@coreui/coreui-vue-chartjs'
 
 export default {

src/views/charts/CalloutChartExample.vue

@@ -64,12 +64,6 @@ export default {
         }
       }
     }
-  },
-
-  methods: {
-    getVariant (val, el) {
-      return val[0] === '#' ? val : getStyle(`--${val}`, el)
-    }
   }
 }
 </script>

src/views/charts/MainChartExample.vue

@@ -9,7 +9,6 @@
 <script>
 import { CChartLine } from '@coreui/coreui-vue-chartjs'
 import { getColor, hexToRgba } from '@coreui/coreui/dist/js/coreui-utilities'
-import { customTooltips } from '@coreui/coreui-plugin-chartjs-custom-tooltips'
 
 function random (min, max) {
   return Math.floor(Math.random() * (max - min + 1) + min)
@@ -65,7 +64,7 @@ export default {
     },
     defaultOptions () {
       return {
-      
+
         maintainAspectRatio: false,
         legend: {
           display: false