Hide new branch when current is selected (#451)

Hide is best approach here

Reviewed-on: https://gitea.com/gitnex/GitNex/pulls/451
Reviewed-by: opyale <opyale@noreply.gitea.io>
Reviewed-by: 6543 <6543@noreply.gitea.io>

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

@@ -155,6 +155,7 @@
                 android:gravity="end" />
 
             <TextView
+                android:id="@+id/branchNameId"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:text="@string/newFileBranchTintCopy"
@@ -178,6 +179,7 @@
                 android:inputType="textCapSentences|text" />
 
             <TextView
+                android:id="@+id/branchNameHintText"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:text="@string/newFileNewBranchMessage"