sagemathgh-37883: gap: don't use deprecated LaTeX() and LaTeXObj()

These functions were removed in 4.13, but they weren't very good anyway.

This PR replaces its usage. It should work fine on old gap so this can
be merged just fine.

### 📝 Checklist

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URL: sagemath#37883
Reported by: Gonzalo Tornaría
Reviewer(s): Travis Scrimshaw

build/pkgs/configure/checksums.ini

@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=2d6779beb2e69f0f7bddc2edc44ad275442ffd29
-md5=789344e03a6b57ba1538c0c760449720
-cksum=3806733369
+sha1=e0222376823475faac337ea488d4a30304b4ea9a
+md5=c51194c0b4c266ab5affd32a5c22d77f
+cksum=2696744150

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-0a7b2513287af1124a358c2494b8bef4668a1882
+f740aeac06a83268aa0df435948d04229b7a574b

src/sage/groups/libgap_wrapper.pyx

@@ -602,14 +602,11 @@ cdef class ElementLibGAP(MultiplicativeGroupElement):
             sage: from sage.groups.libgap_group import GroupLibGAP
             sage: G = GroupLibGAP(libgap.FreeGroup('a', 'b'))
             sage: g = G.gen(0) * G.gen(1)
-            sage: g._latex_()
-            "ab%\n"
-        """
-        try:
-            return self.gap().LaTeX()
-        except ValueError:
-            from sage.misc.latex import latex
-            return latex(self._repr_())
+            sage: latex(g)
+            \text{\texttt{a*b}}
+        """
+        from sage.misc.latex import latex
+        return latex(self._repr_())
 
     cpdef _mul_(left, right):
         """

src/sage/interfaces/gap.py

@@ -1562,16 +1562,10 @@ def _latex_(self):
 
             sage: s = gap("[[1,2], [3/4, 5/6]]")
             sage: latex(s)
-            \left(\begin{array}{rr} 1&2\\ 3/4&\frac{5}{6}\\ \end{array}\right)
+            \left[\left[1, 2\right], \left[\frac{3}{4}, \frac{5}{6}\right]\right]
         """
-        P = self._check_valid()
-        try:
-            s = P.eval('LaTeXObj(%s)' % self.name())
-            s = s.replace('\\\\', '\\').replace('"', '')
-            s = s.replace('%\\n', ' ')
-            return s
-        except RuntimeError:
-            return str(self)
+        from sage.misc.latex import latex
+        return latex(self._sage_())
 
     @cached_method
     def _tab_completion(self):