Bug 490470

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SUMMARY
calculator does not assume that a zero goes before the decimal point for instance i get input error if i .2*100 
but it will work perfectly if i put 0.2*100 it took posting on reddit to figure out why the calculator app wasnt working and had to resort to using google to find the percentage

STEPS TO REPRODUCE
1. type .2*100 into the calculator 
2. 
3. 

OBSERVED RESULT
input error

EXPECTED RESULT
20

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Manjaro Linux (x86_64)
(available in About System)
KDE Plasma Version: 24.05.1
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION