Remove unused imports (#7224)

This fixes some warnings
in the tests.

Author: pjonsson

lib/Models/Catalog/Ows/WebProcessingServiceCatalogFunction.ts

@@ -8,7 +8,6 @@ import {
   makeObservable,
   override
 } from "mobx";
-import CesiumMath from "terriajs-cesium/Source/Core/Math";
 import URI from "urijs";
 import filterOutUndefined from "../../../Core/filterOutUndefined";
 import isDefined from "../../../Core/isDefined";

lib/ReactViews/Analytics/RectangleParameterEditor.jsx

@@ -16,7 +16,6 @@ import { withTranslation } from "react-i18next";
 import { observer } from "mobx-react";
 import { runInAction } from "mobx";
 import CommonStrata from "../../Models/Definition/CommonStrata";
-import { t } from "i18next";
 
 @observer
 class RectangleParameterEditor extends React.Component {

lib/Styled/Input.tsx

@@ -1,5 +1,5 @@
 import React from "react";
-import styled, { css, DefaultTheme, useTheme } from "styled-components";
+import styled, { css, useTheme } from "styled-components";
 import Box, { IBoxProps } from "./Box";
 
 export interface CommonProps {