No errors when using `stock` on a variable with a name starting with `@`

[Daniel-Cortez]

Issue description:

The compiler issues error 042 (invalid combination of class specifiers) when specifier stock is used when defining a function whose name starts with @ (because such names imply public, and public functions can't be stock), but doesn't do the same for variables.

Minimal complete verifiable example (MCVE):

stock @Func(){} // error 042: invalid combination of class specifiers
stock @var = 0; // no errors/warnings

Workspace Information:

• Compiler version: 3.2.3664, 3.10.10
• Command line arguments provided (or sampctl version):
• Operating System:

[stale[bot]]

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