Fix "return" key in disassembler widget (#3090)

[whol-hoopa]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've updated the documentation with the relevant information (if needed)

Detailed description

the "return" key used to not be able to jump to the addresses with conditional jumps other than "jmp"
the "return" key can do it now

Test plan (required)

1. go to disassembly widget
2. put the disassembly cursor onto a disassembly line with a jump
3. press "return" key

Closing issues

closes #3090

[karliss]

I don't think this a proper fix. jumpToOffsetUnderCursor is also used in other places and those will probably have the same problems as enter key.

Other issue is that the offsetUnderCursor handled not only jump arrows. It also included reference to absolute memory locations like for mov and lea instructions.

[whol-hoopa]

I'll look at it again.

[whol-hoopa]

I'll open a new one because I messed up with git commands

[wargio]

no worries

[whol-hoopa]

I reopened the pull request. It's pull request #3146 now.
@karliss I changed it and it should be working now. I made changes to the graph and disassembly widget, because they use jumpToOffsetUnderCursor.