MDL-45336 choice: removed unused code

function prepare_choice_show_results() is never called with the 5th argument,
forming of html has been moved to the renderer in MDL-20508, when function
choice_show_results() was transformed into prepare_choice_show_results() but
not all code was deleted from the funciton.
MDL-45336 scorm: copied used string from quiz

AMOS BEGIN
 CPY [deleteselected,quiz_overview],[deleteselected,mod_scorm]
AMOS END
MDL-45336 question: moved used string from quiz plugin

AMOS BEGIN
 MOV [erroritemappearsmorethanoncewithdifferentweight,quiz_statistics],[erroritemappearsmorethanoncewithdifferentweight,question]
AMOS END
MDL-45336 qtype_numerical: use own strings instead of mod_quiz

These strings have already been copied from mod_quiz to qtype_numerical but
in the qtype_numerical plugin code the translations from mod_quiz were used.
Even though the strings were already present we copy the translations.

AMOS BEGIN
 CPY [invalidnumericanswer,mod_quiz],[invalidnumericanswer,qtype_numerical]
 CPY [multiplier,mod_quiz],[qtype_numerical]
 CPY [invalidnumerictolerance,mod_quiz],[qtype_numerical]
AMOS END
MDL-45336 question: move the missing type strings to question

AMOS BEGIN
 CPY [deletedquestiontext,qtype_missingtype],[deletedquestiontext,core_question]
 CPY [warningmissingtype,qtype_missingtype],[warningmissingtype,core_question]
AMOS END
MDL-45336 questionbank: use core strings instead of quiz

AMOS BEGIN
 CPY [categories,mod_quiz],[categories,question]
 CPY [unusedcategorydeleted,mod_quiz],[unusedcategorydeleted,question]
AMOS END
MDL-45336 lesson: copied used strings from quiz

AMOS BEGIN
 CPY [false,mod_quiz],[false,mod_lesson]
 CPY [fractionsaddwrong,mod_quiz],[fractionsaddwrong,mod_lesson]
 CPY [fractionsnomax,mod_quiz],[fractionsnomax,mod_lesson]
 CPY [notenoughsubquestions,mod_quiz],[notenoughsubquestions,mod_lesson]
 CPY [true,mod_quiz],[true,mod_lesson]
AMOS END