Remove symbols shifted layout

java/res/xml-sw600dp/kbd_10_10_7_symbols_shift.xml

java/res/xml-sw600dp/row_symbols4.xml

java/res/xml-sw600dp/row_symbols_shift4.xml

java/res/xml-sw600dp/rowkeys_symbols2.xml

java/res/xml-sw600dp/rowkeys_symbols3.xml

java/res/xml-sw600dp/rowkeys_symbols_shift1.xml

java/res/xml-sw600dp/rowkeys_symbols_shift3.xml

java/res/xml-sw600dp/rows_10_10_7_symbols.xml

java/res/xml-sw600dp/rows_10_10_7_symbols_shift.xml

java/res/xml-sw600dp/rows_pcqwerty_symbols.xml

java/res/xml-sw600dp/rows_symbols.xml

java/res/xml-sw600dp/rows_symbols_shift.xml

java/res/xml-sw768dp/kbd_10_10_7_symbols.xml

java/res/xml-sw768dp/kbd_thai_symbols_shift.xml

java/res/xml-sw768dp/row_symbols4.xml

java/res/xml-sw768dp/row_symbols_shift4.xml

java/res/xml-sw768dp/rows_10_10_7_symbols.xml

java/res/xml-sw768dp/rows_10_10_7_symbols_shift.xml

java/res/xml-sw768dp/rows_pcqwerty_symbols.xml

java/res/xml-sw768dp/rows_symbols.xml