remove text that can be confusing (fixes #6810)

Author: westnordost

app/src/commonMain/composeResources/values/strings.xml

@@ -1328,7 +1328,6 @@ If there are no signs along the whole street which apply for the highlighted sec
     <string name="quest_openingHours_add_off_days">Add off days</string>
     <string name="quest_openingHours_delete">Delete</string>
     <string name="quest_openingHours_off_day">Off day</string>
-    <string name="quest_openingHours_unspecified_range">Not specified</string>
     <string name="quest_openingHours_chooseMonthsTitle">Select months</string>
     <string name="quest_openingHours_chooseWeekdaysTitle">Select days of the week</string>
     <string name="quest_openingHours_chooseStartTimeTitle">Select start time</string>

app/src/commonMain/kotlin/de/westnordost/streetcomplete/ui/common/opening_hours/MonthsOrDateSelectorText.kt

@@ -62,9 +62,7 @@ private fun getMonthsString(
     locale: Locale,
     layoutDirection: LayoutDirection,
 ): String {
-    if (months.isEmpty()) {
-        return "(" + stringResource(Res.string.quest_openingHours_unspecified_range) + ")"
-    }
+    if (months.isEmpty()) return ""
     val style = DateTimeTextSymbolStyle.Short
 
     return months

app/src/commonMain/kotlin/de/westnordost/streetcomplete/ui/common/opening_hours/WeekdayAndHolidaySelectorsText.kt

@@ -74,9 +74,7 @@ private fun getWeekdaysAndHolidaysString(
     locale: Locale,
     layoutDirection: LayoutDirection,
 ): String {
-    if (weekdays.isEmpty() && holidays.isEmpty()) {
-        return "(" + stringResource(Res.string.quest_openingHours_unspecified_range) + ")"
-    }
+    if (weekdays.isEmpty() && holidays.isEmpty()) return ""
 
     val style = DateTimeTextSymbolStyle.Short
     val sb = StringBuilder()