features: same scale on graph half hour

src/components/ContainerComponents/ViewContainer/SingleFluidViewContainer.tsx

-import React, { useState, useEffect, useContext } from 'react'
+import React, { useState, useContext } from 'react'
 import StyledSpinner from 'components/CommonKit/Spinner/StyledSpinner'
 import CozyBar from 'components/ContainerComponents/CozyBar/CozyBar'
 import Header from 'components/ContainerComponents/Header/Header'
@@ -16,9 +16,7 @@ interface SingleFluidViewContainerProps {
 const SingleFluidViewContainer: React.FC<SingleFluidViewContainerProps> = ({
   fluidTypes,
 }: SingleFluidViewContainerProps) => {
-  const { setPreviousTimeStep, previousTimeStep, chartIsLoaded } = useContext(
-    AppContext
-  )
+  const { setPreviousTimeStep, previousTimeStep } = useContext(AppContext)
 
   const [timeStep, setTimeStep] = useState<TimeStep | null>(
     previousTimeStep && previousTimeStep !== TimeStep.HALF_AN_HOUR