Fix autopopup completion with irrelevant variants after typing 'f' suffix for float number

#KT-4312 Fixed

idea/testData/completion/basic/common/AfterIntSeparatedWithComments.kt

@@ -0,0 +1,7 @@
+fun test() {
+    val floor = "Floor"
+    val a = 1/**/f<caret>
+}
+
+// EXIST: floor
+// EXIST: false