fix format of installing_text

Was submitted in the wrong PNG format (color type 4 instead of 0).

Change-Id: I8780c81eb92bdfc407b43948a92b37d93026325a
diff --git a/res/images/installing_text.png b/res/images/installing_text.png
index 0557350..42704b9 100644
--- a/res/images/installing_text.png
+++ b/res/images/installing_text.png
Binary files differ