Check presence of dispatch receiver parameter in modifier checks

Also fix typo in "inapplicable infix" diagnostic message

idea/testData/intentions/toInfixCall/noExplicitReceiver.kt

@@ -1,4 +1,4 @@
 // IS_APPLICABLE: false
-// ERROR: 'infix' modifier is inapplicable on this function: must be a member of an extension function
+// ERROR: 'infix' modifier is inapplicable on this function: must be a member or an extension function
 infix fun id(s: String) = s
-val x = <caret>id("0").get(0)
+val x = <caret>id("0").get(0)

idea/testData/intentions/toInfixCall/packageFunctionCall.kt

@@ -1,9 +1,9 @@
 // IS_APPLICABLE: false
-// ERROR: 'infix' modifier is inapplicable on this function: must be a member of an extension function
+// ERROR: 'infix' modifier is inapplicable on this function: must be a member or an extension function
 package ppp
 
 infix fun foo(p: String){}
 
 fun main() {
     ppp.<caret>foo("")
-}
+}

idea/testData/intentions/toInfixCall/singlePackageFunctionCall.kt

@@ -1,6 +1,6 @@
 // WITH_RUNTIME
 // IS_APPLICABLE: false
-// ERROR: 'infix' modifier is inapplicable on this function: must be a member of an extension function
+// ERROR: 'infix' modifier is inapplicable on this function: must be a member or an extension function
 
 package demo
 
@@ -8,4 +8,4 @@ infix fun foo(str: String) = kotlin.io.println(str)
 
 fun main() {
     <caret>demo.foo("")
-}
+}