jams-react-client: rename var and let to const

...client/src/components/CustomUiPreview/CustomUiPreview.tsx

jams-react-client/src/components/Footer/Footer.tsx

...t-client/src/components/PasswordDialog/PasswordDialog.tsx

...ient/src/components/ServerParameters/ServerParameters.tsx

jams-react-client/src/components/Sidebar/Sidebar.tsx

jams-react-client/src/tools.tsx

jams-react-client/src/views/Blueprints/Blueprints.tsx

...act-client/src/views/Blueprints/CreateBlueprintDialog.tsx

jams-react-client/src/views/Contacts/Contacts.tsx

jams-react-client/src/views/Groups/CreateGroupDialog.tsx

jams-react-client/src/views/Groups/EditGroup.tsx

jams-react-client/src/views/Groups/Groups.tsx

jams-react-client/src/views/Settings/General.tsx

...eact-client/src/views/UserProfile/AdminAddUserToGroup.tsx

...react-client/src/views/UserProfile/DisplayUserProfile.tsx

...ct-client/src/views/UserProfile/EditCreateUserProfile.tsx