fix up remaining props issues

Author: hawkrives

source/views/building-hours/detail/schedule-row.ios.js

@@ -24,9 +24,9 @@ export class ScheduleRow extends React.PureComponent {
       <Cell
         cellStyle="RightDetail"
         title={summarizeDays(set.days)}
-        titleTextStyle={isActive ? styles.bold : null}
+        titleTextStyle={isActive ? styles.bold : undefined}
         detail={formatBuildingTimes(set, now)}
-        detailTextStyle={isActive ? styles.bold : null}
+        detailTextStyle={isActive ? styles.bold : undefined}
       />
     )
   }

source/views/components/filter/section-list.js

@@ -70,9 +70,9 @@ export function ListSection({filter, onChange}: PropsType) {
       onPress={() => buttonPushed(val)}
       disableImageResize={true}
       image={
-        spec.showImages && <Image style={styles.icon} source={val.image} />
+        spec.showImages ? <Image style={styles.icon} source={val.image} /> : undefined
       }
-      accessory={includes(selected, val) && 'Checkmark'}
+      accessory={includes(selected, val) ? 'Checkmark' : undefined}
       cellStyle="RightDetail"
       cellContentView={
         <Column style={styles.content}>
@@ -89,7 +89,7 @@ export function ListSection({filter, onChange}: PropsType) {
         key="__show_all"
         title="Show All"
         onPress={showAll}
-        accessory={selected.length === options.length ? 'Checkmark' : null}
+        accessory={selected.length === options.length ? 'Checkmark' : undefined}
       />
     )
     buttons = [showAllButton].concat(buttons)