Allow for X and Y offsets in GUI

These can be used to center a lower resolution theme onto a
higher resolution screen. May be useful for Nexus 9 unless or
until we decide to do a 1536x2048 theme or on devices like the
Moto 360 and LG G Watch R.

The build flags will only affect the stock theme. If a custom
theme wishes to apply an offset, it can be done by setting
tw_x_offset and / or tw_y_offset in the variables section of the
XML.

Change-Id: I2390769ed861b96a4a3bb8a0f06d9021ec91b6b9
diff --git a/gui/devices/portrait/res/portrait.xml b/gui/devices/portrait/res/portrait.xml
index b732974..bb8e372 100644
--- a/gui/devices/portrait/res/portrait.xml
+++ b/gui/devices/portrait/res/portrait.xml
@@ -1041,7 +1041,7 @@
 			<object type="button">
 				<highlight color="%highlight_color%" />
 				<fill color="%button_fill_color%" />
-				<placement x="%col1_x%" y="%wipe_button_row1%" w="%button_fill_full_width%" h="%button_fill_half_height%" placement="5" />
+				<placement x="%col1_x%" y="%wipe_button_row1%" w="%button_fill_full_width%" h="%button_fill_half_height%" />
 				<font resource="font" color="%button_text_color%" />
 				<text>Repair or Change File System</text>
 				<actions>
@@ -1494,7 +1494,7 @@
 			<object type="button">
 				<highlight color="%highlight_color%" />
 				<fill color="%button_fill_color%" />
-				<placement x="%col1_x%" y="%row1_header_y%" w="%button_fill_full_width%" h="%button_fill_quarter_height%" placement="5" />
+				<placement x="%col1_x%" y="%row1_header_y%" w="%button_fill_full_width%" h="%button_fill_quarter_height%" />
 				<font resource="font" color="%button_text_color%" />
 				<text>Backup Name: %tw_backup_name%</text>
 				<actions>