[evasgl] Delete checking checksum when copy old shader

[evasgl] Delete checking checksum when copy old shader

when application use runtime shader, it add runtime shader when application shutdown.
for add runtime shader, they copy old shader file to temp file  and modify,rename this.
but in this case, eet_open & checksum check is failed.
because temp file is empty (it didn't write checksum)

so delete checking checksum when copy old shader to temp file.

Change-Id: I4930bd14922429e4eb85ad41d5ffd0b7dbff6d75