Fix completion of 'else' keyword

#KT-14665 fixed

idea/idea-completion/testData/keywords/ElseAfterBlocklessIf.kt

@@ -0,0 +1,8 @@
+fun foo(p: Int) {
+    var x = 0
+    if (p > 0)
+        x += p
+    el<caret>
+}
+
+//EXIST: else

idea/idea-completion/testData/keywords/ElseOnOtherLine.kt

@@ -0,0 +1,8 @@
+fun foo(p: Int) {
+    if (p > 0) {
+
+    }
+    el<caret>
+}
+
+//EXIST: else