Avoid accessing inactive union fields in completeDot
#1115
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As reported on Discord by CodotakuYT:
```zig
fn populate(T: type, index: i32) T {
_ = index;
@typeinfo(T).struct.
}
```
```
thread 17384 panic: access of union field 'ast_node' while field 'param_payload' is active
C:\Users\taoua\zls\src\features\completions.zig:875:61: 0x7ff68070caac in completeDot (zls.exe.obj)
const node_data = nodes_data[local_decl.decl.ast_node];
```
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As reported on Discord by CodotakuYT: