KT-3341 Prohibit val/var keywords for catch parameters

#KT-3341

compiler/testData/diagnostics/tests/controlStructures/valVarCatchParameter.kt

@@ -0,0 +1,13 @@
+fun f() {
+    try {
+    } catch (<!VAL_OR_VAR_ON_CATCH_PARAMETER!>val<!> e: Exception) {
+    }
+
+    try {
+    } catch (<!VAL_OR_VAR_ON_CATCH_PARAMETER!>var<!> e: Exception) {
+    }
+
+    try {
+    } catch (e: Exception) {
+    }
+}