폰트 이름 변경

pretendard_bold -> bold
pretendard_regular -> regular
pretendard_medium -> medium
pretendard_light -> light

app/src/main/res/layout/fragment_explorer.xml

@@ -35,7 +35,7 @@
                 android:layout_height="match_parent"
                 android:layout_gravity="center_vertical"
                 android:background="@null"
-                android:fontFamily="@font/pretendard_medium"
+                android:fontFamily="@font/medium"
                 android:gravity="center_vertical"
                 android:hint="채널명을 입력해보세요"
                 android:importantForAutofill="no"
@@ -92,6 +92,6 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/fl_search_channel"
-            android:fontFamily="@font/pretendard_medium" />
+            android:fontFamily="@font/medium" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </androidx.core.widget.NestedScrollView>