CandidateApplicability: merge INAPPLICABLE_MODIFIER into CONVENTION_ERROR

compiler/fir/analysis-tests/testData/resolve/expresssions/invoke/implicitTypeOrder.fir.txt

@@ -5,7 +5,7 @@ FILE: implicitTypeOrder.kt
         }
 
         public final fun bar(): R|A| {
-            ^bar R|/foo|.<Inapplicable(INAPPLICABLE_MODIFIER): /A.invoke>#()
+            ^bar R|/foo|.<Inapplicable(CONVENTION_ERROR): /A.invoke>#()
         }
 
         public final fun invoke(): R|A| {

compiler/fir/analysis-tests/testData/resolve/qualifierWithCompanion.fir.txt

@@ -26,5 +26,5 @@ FILE: qualifierWithCompanion.kt
         local final fun R|my/A|.invoke(): R|kotlin/Unit| {
         }
 
-        Q|my|.R|my/xx|.<Inapplicable(INAPPLICABLE_MODIFIER): <local>/invoke>#()
+        Q|my|.R|my/xx|.<Inapplicable(CONVENTION_ERROR): <local>/invoke>#()
     }