Ensure there is no dup and cleanup

vector/src/androidTest/java/im/vector/app/features/roomdirectory/ExplicitTermFilterTest.kt

@@ -125,4 +125,4 @@ class ExplicitTermFilterTest : InstrumentedTest {
     fun canSearchForTrue() {
         explicitTermFilter.canSearchFor("android") shouldBe true
     }
-}
+}

vector/src/main/java/im/vector/app/features/roomdirectory/ExplicitTermFilter.kt

@@ -27,6 +27,7 @@ class ExplicitTermFilter @Inject constructor(
             .orEmpty()
             .split("\n")
             .map { it.trim() }
+            .distinct()
             .filter { it.isNotEmpty() }
 
     private val explicitContentRegex = explicitTerms