re-enable test/sym/store.wat test

[zapashcanon]

see #172

First, the test should be rewritten as:

(module
  (import "symbolic" "i32_symbol" (func $i32_symbol (result i32)))

  (memory $m 1)

  (func $start
    ;; Objective: check 'out of bounds memory access' with symbolic idx store

    call $i32_symbol ;; offset
    i32.const 42 ;; value
    i32.store ;; m[x] <- 42
  )

  (start $start)
)

Then, setting the initial size of the memory to 0 gives an instantaneous result. I'm wondering if we should add the (minimal) size of the memory to the PC at some point ?