Fix more compiler warnings
Fixes the following warnings when compiling using GCC 5.4: CXX OLEDDisplayUi.o ./OLEDDisplayUi.cpp: In member function 'void OLEDDisplayUi::drawFrame()': ./OLEDDisplayUi.cpp:284:48: error: 'y1' may be used uninitialized in this function [-Werror=maybe-uninitialized] x *= dir; y *= dir; x1 *= dir; y1 *= dir; ^ ./OLEDDisplayUi.cpp:284:37: error: 'x1' may be used uninitialized in this function [-Werror=maybe-uninitialized] x *= dir; y *= dir; x1 *= dir; y1 *= dir; ^ ./OLEDDisplayUi.cpp:284:26: error: 'y' may be used uninitialized in this function [-Werror=maybe-uninitialized] x *= dir; y *= dir; x1 *= dir; y1 *= dir; ^ ./OLEDDisplayUi.cpp:284:16: error: 'x' may be used uninitialized in this function [-Werror=maybe-uninitialized] x *= dir; y *= dir; x1 *= dir; y1 *= dir; ^ ./OLEDDisplayUi.cpp: In member function 'void OLEDDisplayUi::drawIndicator()': ./OLEDDisplayUi.cpp:393:35: error: 'y' may be used uninitialized in this function [-Werror=maybe-uninitialized] this->display->drawFastImage(x, y, 8, 8, image); ^ ./OLEDDisplayUi.cpp:393:35: error: 'x' may be used uninitialized in this function [-Werror=maybe-uninitialized] ./OLEDDisplayUi.cpp:387:7: error: 'posOfHighlightFrame' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (posOfHighlightFrame == i) { ^ cc1plus: some warnings being treated as errors
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