[Analysis API FIR] fix KtSymbol creation for _ destructuring parameter

We need to have a corresponding declaration in the FIR tree,
so we can create a symbol for it

^KT-60904 fixed
^KT-60904 fixed

compiler/testData/diagnostics/tests/redeclarations/RedeclaredValsAndVars.fir.txt

@@ -48,4 +48,5 @@ FILE: RedeclaredValsAndVars.fir.kt
 
         lval <destruct>: R|A| = R|/A.A|()
         lval _: R|kotlin/Int| = R|<local>/<destruct>|.R|/A.component1|()
+        lval <unused var>: R|kotlin/String| = R|<local>/<destruct>|.R|/A.component2|()
     }