cgen: dump expr ignore ptr ampersands

[pektezol]

Fixes #22794

Printing a pointer outputs only the value, but dumping it prepends '&'.

This pr removes the part in cgen::dump_expr_defintions that prepends ampersand for the number of '*'s, matching the same output as print. The part was added in #10912

Not sure if they should actually be removed from dump though. First time contributor :)

_{Huly®: V_0.6-21375}

[spytheman]

Dumping is intended for debugging. I think that it works better with showing the level of indirections that a pointer has, and so this PR should not be merged, and the issue should be just closed.

@medvednikov what do you think?

[medvednikov]

I agree.